Which metal is more reactive than magnesium? [mr-2]
Gold
Sodium
Iron
Aluminium
Which metal is more reactive than hydrogen but less reactive than carbon? [mr-3]
Gold
Sodium
Iron
Aluminium
Which metal is less reactive than sodium but cannot be extracted using carbon? [mr-4]
Gold
Potassium
Iron
Aluminium
Which is formed when a metal reacts with cold water? [mr-5]
a metal hydroxide
a salt
carbon dioxide
an oxide
Which is a compound formed when a metal reacts with an acid? [mr-6]
a metal hydroxide
a salt
hydrogen
an oxide
Which is formed when a metal reacts with either water or an acid? [mr-7]
a metal hydroxide
a salt
hydrogen
an oxide
Which is formed when a heated metal reacts with steam? [mr-8]
a metal hydroxide
a salt
carbon dioxide
an oxide
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ... Metal Wa does not readily react with dilute acid Metals Xb and Yc react slowly with acid Metal Zd will displace Yc from the
sulfate salt solution of Yc, YcSO4(aq). Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl2(aq). If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ... which metal corresponds to (1), the most reactive of the four metals? [mr-9]
metal Xb
metal Zd
metal Yc
metal Wa
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ... Metal Wa does not readily react with dilute acid Metals Xb and Yc react slowly with acid Metal Zd will displace Yc from the
sulfate salt solution of Yc, YcSO4(aq). Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl2(aq). If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ... which metal corresponds to (2), the 2nd most reactive of the four metals? [mr-10]
metal Xb
metal Zd
metal Yc
metal Wa
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ... Metal Wa does not readily react with dilute acid Metals Xb and Yc react slowly with acid Metal Zd will displace Yc from the
sulfate salt solution of Yc, YcSO4(aq). Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl2(aq). If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ... which metal corresponds to (3), the 3rd most reactive of the four metals? [mr-11]
metal Xb
metal Zd
metal Yc
metal Wa
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ... Metal Wa does not readily react with dilute acid Metals Xb and Yc react slowly with acid Metal Zd will displace Yc from the
sulfate salt solution of Yc, YcSO4(aq). Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl2(aq). If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ... which metal corresponds to (4), the least reactive of the four metals? [mr-12]
metal Xb
metal Zd
metal Yc
metal Wa
From the four elements listed, which is a metal which is most likely to be found in the ground as the metal itself? [mr-13]
copper
hydrogen
iron
magnesium
From the four elements listed, which is a non-metal with no metallic character at all? [mr-14]
copper
hydrogen
iron
magnesium
From the four elements listed, which is a metal that displaces hydrogen from acids but not from cold water? [mr-15]
copper
gold
iron
magnesium
From the four elements listed, which is a metal that cannot be extracted by displacement with carbon? [mr-16]
copper
hydrogen
iron
magnesium
Which is formed by the reaction of heated magnesium with steam? [mr-17]
magnesium oxide + hydrogen
magnesium hydroxide + hydrogen
magnesium chloride + hydrogen
magnesium
sulfate + hydrogen
Which is formed by the reaction of magnesium with cold water? [mr-18]
magnesium oxide + hydrogen
magnesium hydroxide + hydrogen
magnesium chloride + hydrogen
magnesium
sulfate + hydrogen
Which is formed by the reaction of magnesium with hydrochloric acid? [mr-19]
magnesium chloride + water
magnesium hydroxide + hydrogen
magnesium chloride + hydrogen
magnesium
sulfate + chlorine
Which is formed by the reaction of magnesium with
sulfuric acid? [mr-20]
magnesium
sulfate + water
magnesium hydroxide +
sulfur dioxide
magnesium chloride + hydrogen
magnesium
sulfate + hydrogen
Which of A to D is less reactive than copper? [mr-21]
Platinum
Potassium
Zinc
Magnesium
Which is more reactive than magnesium? [mr-22]
Platinum
Potassium
Zinc
Tin
Which is more reactive than hydrogen but less reactive than carbon? [mr-23]
Platinum
Potassium
Zinc
Magnesium
Which is less reactive than sodium but cannot be extracted from its ore using carbon? [mr-24]
Platinum
Potassium
Zinc
Magnesium
Which is found in rocks as the metal itself? [mr-25]
Gold
Carbon
Zinc
Potassium
Which is a non-metal with a little metallic character? [mr-26]
Gold
Carbon
Zinc
Potassium
Which is a metal that displaces hydrogen from dilute acids but not from cold water? [mr-27]
Gold
Carbon
Zinc
Potassium
Which cannot be extracted from its ore with carbon? [mr-28]
Gold
iron
Zinc
Potassium
Which of these in contact with iron will cause rusting? [mr-29]
air and water
boiled saltwater
dry pure oxygen
pure boiled water
A steel pier in the sea rusts. The rust consists of? [mr-30]
Rust readily forms if an iron object is surrounded by? [mr-45]
water with dissolved oxygen
water with no dissolved oxygen
boiled dilute acid
dry air
Which of the following cannot be predicted about metal X, given its position in the reactivity series of metals? [mr-46]
whether X reacts with acid to form hydrogen
whether X acts as a catalyst
the method of extraction of X from an ore
the product of reacting metal X with the
sulfate solution of another metal
Which will displace iron from iron oxide? [mr-47]
tin
copper
magnesium
silver
Road tankers carrying acid use steel tanks lined with glass. The glass is used because? [mr-48]
glass only reacts with alkalis
steel is not strong enough on its own
glass is flexible enough to withstand a crash
acid reacts with steel forming hydrogen
Corrosion occurs when a metal is attacked by? [mr-49]
oxygen
hydrogen
nitrogen
carbon dioxide
When scrap iron is added to blue copper
sulfate solution, a pinky-brown deposit is formed and a pale green solution is left above it. The pinky-brown deposit is? [mr-50]
steel
copper metal
iron
sulfate
rust
When scrap iron is added to blue copper
sulfate solution, a pinky-brown deposit is formed and a pale green solution is left above it. The pale green solution is of? [mr-51]
sulfuric acid
iron oxide
iron
sulfate
copper chloride
When iron becomes coated in rust, the chemical process is an example of? [mr-52]
electrolysis
electroplating
reduction
oxidation
The steel hulls of ships can be protected from rusting by bolting on blocks of which more reactive metal? [mr-61]
zinc
tin
copper
iron
Steel pipes underground can be protected from rusting by attaching blocks of the more reactive metal? [mr-62]
tin
magnesium
copper
iron
Aluminium window frames do not corrode away because the aluminium is? [mr-63]
not reactive enough with oxygen
not reactive enough with water
coated in a layer of aluminium oxide
not capable of forming an oxide
The rusting of iron is described as an oxidation because the iron atoms? [mr-65]
combine with oxygen atoms
gain electrons
combine with water molecules
are so reactive
Which reacts with water to form hydrogen? [mr-66]
zinc
potassium
copper
mercury
Salt water speeds up the corrosion of metals because it contains ions from salts like sodium chloride. Aluminium can be used for the upper structures of ships because the aluminium? [mr-68]
will not react at all with sea water
will not react with oxygen
is not capable of forming soluble aluminium chloride
is coated in a protective layer of aluminium oxide
In which reaction is a metal oxidised? [mr-69]
magnesium + water (steam) ==> magnesium oxide + hydrogen
carbon + oxygen ==> carbon dioxide
hydrogen + lead oxide ==> lead + water
copper oxide + carbon ==> copper + carbon dioxide
In which reaction is a solid non-metal oxidised? [mr-70]
magnesium + water (steam) ==> magnesium oxide + hydrogen
carbon + water ==> hydrogen + carbon monoxide
hydrogen + lead oxide ==> lead + water
copper oxide + hydrogen ==> copper + water
In which reaction is a gaseous non-metal oxidised? [mr-71]
magnesium + water ==> magnesium hydroxide + hydrogen
carbon + water ==> hydrogen + carbon monoxide
hydrogen + lead oxide ==> lead + water
copper oxide + carbon ==> copper + carbon dioxide
In which reaction is a metal oxide reduced? [mr-72]
magnesium + water ==> magnesium hydroxide + hydrogen
carbon + water ==> hydrogen + carbon monoxide
water (steam) + magnesium ==> magnesium oxide + hydrogen
copper oxide + carbon ==> copper + carbon dioxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as an oxidation only? [mr-73]
carbon ==> carbon monoxide
lead oxide ==> lead
copper oxide + hydrogen ==> copper + water
carbon dioxide ==> carbon monoxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as a reduction only? [mr-74]
carbon ==> carbon monoxide
lead oxide ==> lead
copper oxide + hydrogen ==> copper + water
carbon monoxide ==> carbon dioxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as an oxidation and reduction (redox)? [mr-75]
carbon ==> carbon monoxide
lead oxide ==> lead
copper oxide + hydrogen ==> copper + water
carbon monoxide ==> carbon dioxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as an oxidation and reduction (redox)? [mr-76]
carbon ==> carbon monoxide
lead oxide ==> lead
carbon dioxide ==> carbon monoxide
iron oxide + carbon ==> iron + carbon dioxide
Given the following four observations of the reactions of four metals ... (1) Metals F and G slowly react with water (2) Metal H will displace metal G form its chloride salt solution (3) Metal E will not react with dilute acids (4) Metal H will NOT displace metal F from its
sulfate salt solution What is their reactivity order, from the most to the least reactive? [mr-86]
F > H > G > E
H > E > F > G
E > G > H > F
H > G > F > E
Given the following five observations of the reactions of four metals with hydrogen (H), carbon (C) and other metal oxides ... (1) Metal Y can displace metal Z from its oxide (2) Carbon can displace metal W and metal X from their oxides (3) Hydrogen will displace metal W from its oxide (4) Hydrogen will NOT displace metal X from its oxide (5) Carbon will NOT displace metals Y and Z from their oxides What is their reactivity order, from the most to the least reactive? [mr-87]
(C) > W > X (H) > Y > Z
Y > Z > (C) > X > (H) > W
Z > Y > (C) > W > (H) > X
Y > W > (C) > X > (H) > Z
Underground pipes made of steel (alloy of iron) can be protected from rusting if you attach metal blocks made of the more reactive metal? [mr-88]
chromium alloy
less reactive metal than iron
metal more reactive than iron
a metal of similar reactivity
When copper is heated in air, the oxide compound formed is ? in colour. [mr-92]
green
orange
black
white
When magnesium burns in air, the oxide compound formed is ? in colour. [mr-93]
green
orange
black
white
Given the following three observations of the reactions of four metals ... (1) Metal O will displace metal N from its chloride (2) Only metal L reacts with cold water (3) Metal N reacts faster with acid than metal M What is their reactivity order, from the most to the least reactive? [mr-94]
L > O > N > M
O > L > N > M
L > N > O > M
M > O > N > L
Given the following ionic redox equation for the displacement of copper from copper(II)
sulfate using zinc metal ... Zn(s) + Cu2+(aq) ==> Zn2+(aq) + Cu(s) In the reaction which is oxidised? [mr-41]
Zn(s)
Cu2+(aq)
Zn2+(aq)
Cu(s)
Given the following ionic redox equation for the displacement of copper from copper(II)
sulfate using zinc metal ... Zn(s) + Cu2+(aq) ==> Zn2+(aq) + Cu(s) In the reaction which is reduced? [mr-42]
Zn(s)
Cu2+(aq)
Zn2+(aq)
Cu(s)
Given the following ionic redox equation for the displacement of copper from copper(II)
sulfate using zinc metal ... Zn(s) + Cu2+(aq) ==> Zn2+(aq) + Cu(s) In the reaction which is formed by an electron loss or oxidation process? [mr-43]
Zn(s)
Cu2+(aq)
Zn2+(aq)
Cu(s)
Given the following ionic redox equation for the displacement of copper from copper(II)
sulfate using zinc metal ... Zn(s) + Cu2+(aq) ==> Zn2+(aq) + Cu(s) In the reaction which is formed by an electron gain or reduction process? [mr-44]
Zn(s)
Cu2+(aq)
Zn2+(aq)
Cu(s)
Given the following equation: Mg(s) + ? ==> MgCl2(aq) + H2(g) Which of A-D is missing ? [mr-77]
2HCl(aq)
H2Cl2(aq)
HCl(aq)
(HCl)2(aq)
Given the following equation: Ca(s) + 2H2O(l) ==> ? + H2(g) Which of A-D missing ? [mr-78]
CaOH2(aq)
Ca(OH)2(aq)
2CaOH(aq)
Ca2OH(aq)
Given the following equation: Zn(s) + H2SO4(aq) ==> ? + H2(g) Which of A-D is missing ? [mr-79]
2ZnSO4(aq)
Zn2SO4(aq)
ZnSO4(aq)
Zn(SO4)2(aq)
Given the following equation: Mg(s) + ? ==> MgO(s) H2(g) Which of A-D is missing ? [mr-80]
OH(g)
H2O2(g)
OH2(g)
H2O(g)
Given the following equation: Zn(s) + ? ==> ZnSO4(aq) + Fe(s) Which of A-D is missing ? [mr-81]
FeSO4(aq)
Fe2SO4(aq)
Fe(SO4)2(aq)
H2SO4(aq)
Given the following equation: ? + 3Zn(s) ==> 2Fe(s) + 3ZnSO4(aq) Which of A-D is missing ? [mr-82]
2FeSO4(aq)
Fe2(SO4)3(aq)
3FeSO4(aq)
Fe(SO4)3(aq)
Given the following equation: 2Al(s) + 3CuO(s) ==> ? + 3Cu(s) Which of A-D is missing ? [mr-83]
2AlO3(s)
AlO3(s)
Al2O3(s)
Al3O2(s)
Given the following equation: 2K(s) + 2H2O(l) ==> ? + H2(g) Which of A-D is missing ? [mr-84]
KOH(aq)
KOH2(aq)
K2OH(aq)
2KOH(aq)
The rusting of iron is described as an oxidation because the iron atoms? [mr-85]
lose electrons
lose oxygen atoms
combine with water
are not very reactive
Which of the following is a definition of oxidation? [mr-95]
gain of electrons
loss of electrons
gain of hydrogen
loss of oxygen
Which of the following is a definition of reduction? [mr-96]
gain of oxygen
loss of electrons
gain of electrons
loss of hydrogen
Which of the following is a definition of reduction? [mr-97]
gain of oxygen
loss of electrons
loss of hydrogen
loss of oxygen
Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode
initially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means? [mr-103]
iron corrodes faster when connected to a more reactive metal
iron corrodes faster when connected to a less reactive metal
tin is more reactive than iron
zinc is less reactive than iron
Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode
initially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means? [mr-104]
iron corrodes faster when connected to a more reactive metal
iron corrodes slower when connected to a less reactive metal
tin is less reactive than iron
zinc is less reactive than iron
Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode
initially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means? [mr-105]
iron corrodes faster when connected to a more reactive metal
iron corrodes slower when connected to a less reactive metal
tin is less reactive than iron
zinc is less reactive than iron
Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode
initially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means? [mr-106]
iron corrodes faster when connected to a more reactive metal
iron corrodes slower when connected to a less reactive metal
tin is more reactive than iron
zinc is more reactive than iron
Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode
initially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means? [mr-107]
iron corrodes slower when connected to a more reactive metal
iron corrodes slower when connected to a less reactive metal
tin is more reactive than iron
zinc is less reactive than iron
If an iron sheet is dipped into a silver nitrate solution it becomes coated in grey layer of silver. The overall reaction is an example of? [mr-115]
displacement
reduction only
electrolysis
neutralisation
If an iron sheet is dipped into a copper
sulfate solution it becomes coated in pink-brown deposit of copper. This formation of the copper is an example of? [mr-116]
oxidation only
reduction only
electrolysis
neutralisation
This means a chemical reaction is? [am-1]
reversible
exothermic
endothermic
decomposition
For a chemical reaction, the word 'reversible' means? [am-4]
heat is alternately given out and taken in as the reaction proceeds
reactants can only be converted to products
the products and reactants of a reaction are in a state of balance
products can be readily converted back to reactants
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-5]
from left to right is called the forward reaction
from right to left is called the equilibrium reaction
if left to right is exothermic, from right to left is also exothermic
if left to right is endothermic, from right to left is also endothermic
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-6]
from left to right is called the reversible reaction
from right to left is called the backward reaction
if left to right is exothermic, from right to left is also exothermic
if left to right is endothermic, from right to left is also endothermic
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-7]
from left to right is called the reversible reaction
from right to left is called the equilibrium reaction
if left to right is exothermic, from right to left is endothermic
if left to right is endothermic, from right to left is also endothermic
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-7]
from left to right is called the reversible reaction
from right to left is called the equilibrium reaction
if left to right is exothermic, from right to left is also exothermic
if left to right is endothermic, from right to left is exothermic
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-9]
the gases formed are colourless
the formation of the solid is endothermic
ammonium gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-10]
the gases formed are colourless and green
the formation of the solid is exothermic
ammonium gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-11]
the gases formed are colourless and green
the formation of the solid is endothermic
ammonia gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-12]
the gases formed are colourless and green
the formation of the solid is endothermic
ammonium gas is formed
hydrogen chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-13]
the gases are formed by an endothermic reaction
the formation of the solid is a decomposition reaction
ammonium gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-14]
the forward reaction (L to R) is exothermic
on heating, the hydrated solid changes colour from blue to white
the heating effect can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-15]
the forward reaction (L to R) is exothermic
on heating, the hydrated solid changes colour from white to blue
the reverse reaction can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-16]
the forward reaction (L to R) is exothermic
on heating, the hydrated solid changes colour from white to blue
the heating effect can be used as a test for water
the reaction is reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-17]
the forward reaction (L to R) is endothermic
on cooling the heated solid and adding water, it changes colour from blue to white
the heating effect can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-18]
the reverse reaction (R to L) is endothermic
on cooling the heated solid and adding water, it changes colour from white to blue
the heating effect can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-19]
the forward reaction (L to R) is exothermic
on cooling the heated solid and adding water, it changes colour from blue to white
the reverse reaction (R to L) is exothermic
the heating effect can be used as a test for water
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-20]
the forward reaction (L to R) is exothermic
on cooling the heated solid and adding water, it changes colour from blue to white
the reverse reaction (R to L) is endothermic
the heating effect can be used to make anhydrous copper(II)
sulfate
The in the equation means the reaction is? [am-57]
reversible
decomposable
combustible
unpredictable
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-93]
reactants are always changing into products
rate of forward reaction (L to R) is greater than the rate of the backward reaction (R to L)
the concentrations of reactants and products are constantly changing
using a catalyst increases the final amount of product formed
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-94]
products stop changing into reactants
rate of forward reaction (L to R) is equal to the rate of the backward reaction (R to L)
the concentrations of reactants and products are constantly changing
using a catalyst increases the final amount of product formed
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-95]
products stop changing into reactants
rate of forward reaction (L to R) is greater than the rate of the backward reaction (R to L)
the concentrations of reactants and products remain the same
using a catalyst increases the final amount of product formed
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-96]
products stop changing into reactants
rate of forward reaction (L to R) is greater than the rate of the backward reaction (R to L)
the concentrations of reactants and products are constantly changing
using a catalyst does not increase the final amount of product formed
What is a typical pressure range in the operating conditions for the manufacture of ammonia by the Haber process? [am102]
200 to 400 atm.
1 to 10 atm.
50 to 100 atm.
600-800 atm.
What is a typical temperature range in the operating conditions for the manufacture of ammonia by the Haber process? [am103]
25 to 100oC
300 to 450oC
100 to 200oC
500 to 800oC
Which metal is used in making catalysts for the Haber synthesis of ammonia? [am104]
copper
sodium
iron
gold
This means a chemical reaction is? [am-1]
reversible
exothermic
endothermic
decomposition
A reaction which gives out heat to the surroundings is described as? [am-2]
reversible
exothermic
endothermic
decomposition
A reaction which takes in heat from the surroundings is described as? [am-3]
reversible
exothermic
endothermic
decomposition
For a chemical reaction, the word 'reversible' means? [am-4]
heat is alternately given out and taken in as the reaction proceeds
reactants can only be converted to products
the products and reactants of a reaction are in a state of balance
products can be readily converted back to reactants
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-5]
from left to right is called the forward reaction
from right to left is called the equilibrium reaction
if left to right is exothermic, from right to left is also exothermic
if left to right is endothermic, from right to left is also endothermic
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-6]
from left to right is called the reversible reaction
from right to left is called the backward reaction
if left to right is exothermic, from right to left is also exothermic
if left to right is endothermic, from right to left is also endothermic
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-7]
from left to right is called the reversible reaction
from right to left is called the equilibrium reaction
if left to right is exothermic, from right to left is endothermic
if left to right is endothermic, from right to left is also endothermic
A + B C + D For the type of reaction shown above, which statement is TRUE? [am-7]
from left to right is called the reversible reaction
from right to left is called the equilibrium reaction
if left to right is exothermic, from right to left is also exothermic
if left to right is endothermic, from right to left is exothermic
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-9]
the gases formed are colourless
the formation of the solid is endothermic
ammonium gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-10]
the gases formed are colourless and green
the formation of the solid is exothermic
ammonium gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-11]
the gases formed are colourless and green
the formation of the solid is endothermic
ammonia gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-12]
the gases formed are colourless and green
the formation of the solid is endothermic
ammonium gas is formed
hydrogen chloride gas is formed
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-13]
the gases are formed by an endothermic reaction
the formation of the solid is a decomposition reaction
ammonium gas is formed
chloride gas is formed
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-14]
the forward reaction (L to R) is exothermic
on heating, the hydrated solid changes colour from blue to white
the heating effect can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-15]
the forward reaction (L to R) is exothermic
on heating, the hydrated solid changes colour from white to blue
the reverse reaction can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-16]
the forward reaction (L to R) is exothermic
on heating, the hydrated solid changes colour from white to blue
the heating effect can be used as a test for water
the reaction is reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-17]
the forward reaction (L to R) is endothermic
on cooling the heated solid and adding water, it changes colour from blue to white
the heating effect can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-18]
the reverse reaction (R to L) is endothermic
on cooling the heated solid and adding water, it changes colour from white to blue
the heating effect can be used as a test for water
the reaction is not reversible
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-19]
the forward reaction (L to R) is exothermic
on cooling the heated solid and adding water, it changes colour from blue to white
the reverse reaction (R to L) is exothermic
the heating effect can be used as a test for water
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-20]
the forward reaction (L to R) is exothermic
on cooling the heated solid and adding water, it changes colour from blue to white
the reverse reaction (R to L) is endothermic
the heating effect can be used to make anhydrous copper(II)
sulfate
The in the equation means the reaction is? [am-57]
reversible
decomposable
combustible
unpredictable
On the reaction profile diagrams above, which energy change corresponds to the uncatalysed activation energy for the endothermic thermal
decomposition of ammonia? [am-65]
profile 1, E1
profile 1, E3
profile 2, E5
profile 2, E6
On the reaction profile diagrams above, which energy change corresponds to the overall heat absorbed by the catalysed endothermic thermal
decomposition of ammonia? [am-66]
profile 1, E1
profile 1, E3
profile 2, E5
profile 2, E6
Which is TRUE about reversible reactions and chemical equilibrium? [am-85]
increase in temperature favours an endothermic reaction
decrease in temperature favours the reaction absorbing heat
increase in pressure favours a reaction forming the most gas molecules
decrease in pressure favours a reaction that removes gas molecules
Which is TRUE about reversible reactions and chemical equilibrium? [am-86]
increase in temperature favours the heat releasing reaction
decrease in temperature favours an exothermic reaction
increase in pressure favours a reaction forming gas molecules
decrease in pressure favours the reaction forming the least gas molecules
Which is TRUE about reversible reactions and chemical equilibrium? [am-87]
increase in temperature favours the heat releasing reaction
decrease in temperature favours an endothermic reaction
increase in pressure favours the reaction forming the least gas molecules
decrease in pressure does not favour a reaction forming gas molecules
Which is TRUE about reversible reactions and chemical equilibrium? [am-88]
increase in temperature favours an exothermic reaction
decrease in temperature favours a heat absorbing reaction
increase in pressure favours a reaction forming gas molecules
decrease in pressure favours the reaction forming the most gas molecules
The equation shows the synthesis of ammonia in which 46 kJ heat energy is released (given out) per mole of ammonia formed. Which is TRUE about this reaction? [am-89]
increased pressure favours a larger % of ammonia in the equilibrium mixture
decrease in temperature does not favour a larger % of ammonia in the equilibrium mixture
using a catalyst increases the % of ammonia in the equilibrium mixture
increasing both pressure and temperature favour ammonia formation
The equation shows the synthesis of ammonia in which 46 kJ heat energy is released (given out) per mole of ammonia formed. Which is TRUE about this reaction? [am-90]
increased pressure does not favour a larger % of ammonia in the equilibrium mixture
decrease in temperature favours a larger % of ammonia in the equilibrium mixture
using a catalyst increases the % of ammonia in the equilibrium mixture
increasing both pressure and temperature favour ammonia formation
The equation shows the synthesis of ammonia in which 46 kJ heat energy is released (given out) per mole of ammonia formed. Which is TRUE about this reaction? [am-91]
decreased pressure favours a larger % of ammonia in the equilibrium mixture
increase in temperature favours a larger % of ammonia in the equilibrium mixture
using a catalyst does not affect the % of ammonia in the equilibrium mixture
decreasing both pressure and temperature favour ammonia formation
The equation shows the synthesis of ammonia in which 46 kJ heat energy is released (given out) per mole of ammonia formed. Which is TRUE about this reaction? [am-91]
decreased pressure favours a larger % of ammonia in the equilibrium mixture
increase in temperature favours a larger % of ammonia in the equilibrium mixture
using a catalyst increases the % of ammonia in the equilibrium mixture
increasing pressure and decreasing temperature both favour ammonia formation
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-93]
reactants are always changing into products
rate of forward reaction (L to R) is greater than the rate of the backward reaction (R to L)
the concentrations of reactants and products are constantly changing
using a catalyst increases the final amount of product formed
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-94]
products stop changing into reactants
rate of forward reaction (L to R) is equal to the rate of the backward reaction (R to L)
the concentrations of reactants and products are constantly changing
using a catalyst increases the final amount of product formed
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-95]
products stop changing into reactants
rate of forward reaction (L to R) is greater than the rate of the backward reaction (R to L)
the concentrations of reactants and products remain the same
using a catalyst increases the final amount of product formed
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-96]
products stop changing into reactants
rate of forward reaction (L to R) is greater than the rate of the backward reaction (R to L)
the concentrations of reactants and products are constantly changing
using a catalyst does not increase the final amount of product formed
The equation above shows the making of hydrogen from methane (natural gas) and steam, for the manufacture of ammonia in the Haber Process. For every mole of methane reacted, 206 kJ of heat energy is absorbed (taken in) in forming the three moles of hydrogen. Which is TRUE about this reaction? [am-97]
decreasing the pressure favours a bigger % of hydrogen in the equilibrium mixture
increasing the temperature does not favour a bigger % of hydrogen in the equilibrium mixture
using a catalyst increases the final % of hydrogen in the equilibrium
increasing both pressure and temperature favours the formation of ammonia
The equation above shows the making of hydrogen from methane (natural gas) and steam, for the manufacture of ammonia in the Haber Process. For every mole of methane reacted, 206 kJ of heat energy is absorbed (taken in) in forming the three moles of hydrogen. Which is TRUE about this reaction? [am-98]
decreasing the pressure does not favour a bigger % of hydrogen in the equilibrium mixture
increasing the temperature favours a bigger % of hydrogen in the equilibrium mixture
using a catalyst increases the final % of hydrogen in the equilibrium
increasing both pressure and temperature favours the formation of ammonia
The equation above shows the making of hydrogen from methane (natural gas) and steam, for the manufacture of ammonia in the Haber Process. For every mole of methane reacted, 206 kJ of heat energy is absorbed (taken in) in forming the three moles of hydrogen. Which is TRUE about this reaction? [am-99]
decreasing the pressure does not favour a bigger % of hydrogen in the equilibrium mixture
increasing the temperature does not favour a bigger % of hydrogen in the equilibrium
using a catalyst does not increase the final % of hydrogen in the equilibrium
increasing both pressure and temperature favours the formation of ammonia
The equation above shows the making of hydrogen from methane (natural gas) and steam, for the manufacture of ammonia in the Haber Process. For every mole of methane reacted, 206 kJ of heat energy is absorbed (taken in) in forming the three moles of hydrogen. Which is TRUE about this reaction? [am-100]
decreasing the pressure does not favour a bigger % of hydrogen in the equilibrium mixture
increasing the temperature does not favour a bigger % of hydrogen in the equilibrium
using a catalyst increases the final % of hydrogen in the equilibrium
decreasing the pressure and increasing the temperature both favour the formation of ammonia
What is a typical pressure range in the operating conditions for the manufacture of ammonia by the Haber process? [am102]
200 to 400 atm.
1 to 10 atm.
50 to 100 atm.
600-800 atm.
What is a typical temperature range in the operating conditions for the manufacture of ammonia by the Haber process? [am103]
25 to 100oC
300 to 450oC
100 to 200oC
500 to 800oC
Which metal is used in making catalysts for the Haber synthesis of ammonia? [am104]
copper
sodium
iron
gold
Which reaction is causes the high temperature in a blast furnace? [me-9]
carbon + oxygen ==> carbon dioxide
carbon dioxide + carbon ==> carbon monoxide
iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
[me-17] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE?
in reaction (1) carbon is oxidised
in reaction (2) carbon is reduced
in reaction (3) carbon dioxide is oxidised
in reaction (4) calcium carbonate is reduced
[me-18] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE?
in reaction (1) carbon is reduced
in reaction (2) carbon is oxidised
in reaction (3) carbon dioxide is oxidised
in reaction (4) calcium carbonate is reduced
[me-19] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE?
in reaction (1) carbon is reduced
in reaction (3) iron is oxidised
in reaction (2) carbon dioxide is reduced
in reaction (4) calcium carbonate is oxidised
[me-20] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE?
in reaction (1) carbon is reduced
in reaction (4) calcium carbonate is oxidised
in reaction (2) carbon monoxide is oxidised
in reaction (3) iron oxide is reduced
[me-21] The reactions in the blast furnace to produce iron are summarised by equations (1) to (4). The symbol equations may NOT be numerically balanced. ... (1) C + O2 ==> CO2 ... (2) CO2 + C ==> CO ... (3) Fe2O3 + CO ==> Fe + CO2 ... (4) CaCO3 + SiO2 ==> CaSiO3 + CO2 Which statement is TRUE?
in reaction (3) carbon monoxide is oxidised
in reaction (4) silicon dioxide is reduced
in reaction (1) carbon is reduced
in reaction (3) iron is oxidised
In the reactions in a blast furnace what happens to most of the carbon monoxide? [me-22]
it reacts with carbon to form carbon dioxide
it combines with the oxygen in the iron oxide ore
it reacts with the oxygen in the hot air to form carbon dioxide
it reacts with silica and limestone to form the 'slag'
Oxidation of a substance can be defined as? [me-23]
a molecule reacting with oxygen molecules
an atom losing oxygen atoms
an atom or molecule combining with oxygen
a molecule losing oxygen atoms
Reduction of a substance can be defined as? [me-24]
a molecule not reacting with oxygen molecules
an atom gaining oxygen atoms
an atom or molecule combining with oxygen
a molecule losing oxygen atoms
To produce aluminium, electricity is passed through? [me-31]
molten aluminium oxide and molten cryolite
molten cryolite
molten aluminium oxide
molten aluminium oxide and molten limestone
To produce aluminium by electrolysis the
ore must be molten so that? [me-32]
the aluminium oxide decomposes with the heat
the ions from the ore are free to move
the molecules from the ore are free to move
the aluminium formed will be liquid
During the electrolysis of molten aluminium oxide ore, the aluminium ions move? [me-33]
to the negative electrode because they are negatively charged
to the positive electrode because they are positively charged
to the negative electrode because they are positively charged
to the positive electrode because they are negatively charged
During the electrolysis of molten aluminium oxide ore, the oxide ions move? [me-34]
to the negative electrode because they are negatively charged
to the positive electrode because they are positively charged
to the negative electrode because they are positively charged
to the positive electrode because they are negatively charged
In the extraction of aluminium by electrolysis of molten aluminium oxide ore, the ore is dissolved in cryolite to? [me-35]
lower the melting point of the aluminium ore to reduce the temperature of the process
to decompose the ore into aluminium and oxygen at a higher temperature
to help keep the aluminium molten at a higher temperature
to help stop the electrodes from corroding away at high temperature
In the extraction of aluminium by electrolysis of its ore, the positive electrodes have to be regularly replaced because? [me-36]
they are attacked by hot molten aluminium
they react with oxygen to form a gas
they slowly dissolve in cryolite
they gradually vaporise at the high temperature of the electrolysis cell
In the extraction of aluminium by the electrolysis of molten aluminium oxide ore, the aluminium forms? [me-37]
throughout the bulk of the molten ore
only when the electrodes are close together
only at the negative electrode
only at the positive electrode
In the extraction of aluminium by the electrolysis of molten aluminium oxide ore, oxygen forms? [me-38]
throughout the bulk of the molten ore
only when the electrodes are close together
only at the negative electrode
only at the positive electrode
The name of a common ore from which iron can be extracted is called? [me-39]
haematite
bauxite
cryolite
charcoal
The name of a common ore from which aluminium can be extracted is called? [me-40]
haematite
bauxite
cryolite
charcoal
The name of the substance used to lower the melting point of aluminium oxide ore in the electrolytic extraction of aluminium is called? [me-41]
haematite
bauxite
cryolite
carbon
In the electrolysis of aluminium oxide to extract aluminium, the electrodes are made of? [me-42]
haematite
bauxite
cryolite
carbon
After the initial chemical extraction of copper from a copper ore, the copper is purified by? [me-51]
electrolysis
crystallisation
distillation
hydrolysis
After the initial chemical extraction of copper from a copper ore, the copper is purified by electrolysis. The negative electrode is made of? [me-52]
copper
sulfide
pure copper
impure copper
copper
sulfate
After the initial chemical extraction of copper from a copper ore, the copper is purified by electrolysis. The positive electrode is made of? [me-53]
copper
sulfide
pure copper
impure copper
copper
sulfate
After the initial chemical extraction of copper from a copper ore, the copper is purified by electrolysis. The electrolyte solution contains dissolved? [me-54]
copper
sulfide
pure copper
impure copper
copper
sulfate
Which element is a metal that is most likely to be found in rocks as the metal itself? [me-55]
copper
carbon
iron
sodium
Which element is a non-metal with some metallic character? [me-56]
copper
carbon
iron
sodium
Which element is a metal that displaces hydrogen from dilute acids but not from cold water? [me-57]
copper
carbon
iron
sodium
Which element is a metal that cannot be extracted using carbon? [me-58]
copper
tin
iron
sodium
Which metal is more reactive than hydrogen but less reactive than carbon? [me-59]
tin
aluminium
copper
silver
Which metal is less reactive than sodium but must be extracted using electrolysis of the molten ore? [me-60]
tin
aluminium
lead
silver
Which of these metals should react with dilute hydrochloric acid, but very slowly? [me-61]
calcium
iron
lead
silver
Which metal is most likely to be found in rocks as the metal itself? [me-62]
tin
aluminium
lead
silver
Which contains the iron oxide in the blast furnace extraction of iron? [me-63]
haematite
coke
limestone
sandstone
Which is oxidised in the blast furnace extraction of iron? [me-64]
haematite
coke
limestone
air
Which is NOT a raw material in the blast furnace extraction of iron? [me-66]
haematite
coke
limestone
sandstone
Which metals is obtained from bauxite ore? [me-67]
aluminium
iron
copper
gold
Which metals is obtained from haematite ore? [me-68]
aluminium
iron
copper
gold
Which metals is purified by electrolysis? [me-69]
aluminium
iron
copper
gold
Which metals is most likely to be found as the element and not as an oxide or
sulfide compound? [me-70]
aluminium
iron
copper
gold
Which statement is TRUE? [me-71]
aluminium is obtained from its ore by reduction using electrolysis
iron is obtained from its ore by reduction using electrolysis
aluminium is obtained from its ore by oxidation using carbon
iron is obtained from its ore by oxidation using carbon
Which statement is TRUE? [me-72]
aluminium is obtained from its ore by reduction using carbon
iron is obtained from its ore by reduction using carbon
aluminium is obtained from its ore by oxidation using electrolysis
iron is obtained from its ore by oxidation using electrolysis
A mineral from which a metal can be extracted, is called? [me-73]
compound
mixture
an ore
rock
Which is the reason why aluminium was first extracted commercially by electrolysis in the 19th century but metals like iron had been extracted for thousands of years? [me-74]
no aluminium ores had been previously discovered
there was no electricity supply available until this time
no one was interested in using aluminium
technology was sufficiently advanced by then
Which metal is added to aluminium to make a stronger alloy? [me-77]
magnesium
chromium
gold
sodium
Which metal is added to steel to give it good anti-corrosion properties? [me-78]
magnesium
chromium
gold
sodium
Which metal is found as the free element in the Earth's crust? [me-79]
magnesium
chromium
gold
sodium
Which metal is less reactive than calcium, but whose oxide ore cannot be reduced with carbon? [me-80]
sodium
potassium
zinc
magnesium
Which chemical change corresponds to an electrolysis? [me-81]
aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to a thermal decomposition? [me-82]
aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to an oxidation? [me-83]
aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to a neutralisation? [me-84]
aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to a reduction? [me-85]
changing copper oxide into copper in a smelter
calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Stages in the extraction of iron in a blast furnace are described below after iron ore, coke and limestone have been added at the top, but not in the correct order. (1) carbon dioxide reacts with coke (carbon) to form carbon monoxide (2) limestone combines with acid impurities (3) hot air is blown into the furnace (4) carbon monoxide reacts with iron oxide to make iron (5) coke (carbon) burns to form carbon dioxide Which is the correct order of sequence for (1) to (5)? [me-86]
(5) (3) (1) (2) (4)
(3) (5) (1) (4) (2)
(5) (1) (3) (2) (4)
(3) (5) (4) (1) (2)
Why is hot air blown into a blast furnace? [me-87]
too keep the iron molten
to melt the iron ore
to react with coke and release energy
to react with impurities in the iron
Which is formed on burning coke in the blast furnace? [me-88]
calcium oxide
slag
carbon monoxide
carbon dioxide
Which removes the oxygen from the iron ore in a blast furnace? [me-89]
carbon monoxide
slag
limestone
carbon dioxide
Which is produced when limestone combines with acidic impurities in the blast furnace extraction of iron? [me-90]
carbon monoxide
slag
iron oxide
carbon dioxide
Which is added to a blast furnace to produce carbon monoxide and heat energy? [me-91]
calcium oxide
limestone
carbon
carbon dioxide
Haematite iron ore contains mainly? [me-92]
iron oxide and slag impurities
iron carbonate and calcium oxide
iron carbonate and slag impurities
iron oxide and acidic impurities
Ingots of aluminium from its electrolytic extraction can be stored outside in all weathers. Why do aluminium ingots not corrode away, despite aluminium being quite high in the reactivity series of metals? [me-93]
aluminium is coated in an oxide layer
aluminium will not react with oxygen
aluminium has a particularly shiny surface
it is not a transition metal like chromium
Which pair of elements are non-metals which will displace less reactive metals from their oxide ores? [me-94]
nitrogen and helium
carbon and hydrogen
sulfur and oxygen
chlorine and argon
Given the equation of the reduction of an iron oxide in a blast furnace: ? + 4CO ==> 3Fe + 4CO2 What must the formula of the original iron oxide ore? [me-25]
Fe3O2
Fe4O3
Fe3O4
Fe2O3
It is possible for an iron oxide ore in a blast furnace to be directly reduced by the coke (carbon) to form iron. a Fe2O3 + b C ==> c Fe + d CO2 Which four quantities a, b, c and d give the ratio to balance the equation? [me-26]
1, 3, 6, 3
1, 2, 3, 6
2, 2, 6, 4
2, 3, 4, 3
It is possible for an iron oxide ore in a blast furnace to be directly reduced by the coke (carbon) to form iron. a Fe3O4 + b C ==> c Fe + d CO2 Which four quantities a, b, c and d give the ratio to balance the equation? [me-27]
1, 2, 3, 2
1, 2, 3, 4
2, 3, 6, 3
2, 4, 6, 4
Iron oxide ore in a blast furnace is mainly reduced by carbon monoxide to form iron. a Fe2O3 + b CO ==> c Fe + d CO2 Which four quantities a, b, c and d give the ratio to balance the equation? [me-28]
1, 2, 3, 2
1, 3, 2, 3
2, 6, 2, 3
2, 4, 6, 4
Which is the correct and balanced equation for the formation of carbon monoxide in the blast furnace? [me-29]
CO2 + C ==> CO
CO2 + 2C ==> 2CO
CO2 + C ==> 2CO
2CO2 + C ==> 2CO
Given the equation of the reduction of an iron oxide in a blast furnace ... a Fe3O4 + b CO ==> c Fe + d CO2 Which four quantities a, b, c and d give the ratio to balance the equation? [me-30]
2, 2, 3, 4
1, 4, 2, 3
2, 2, 3, 2
1, 4, 3, 4
In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which is the correct equation to show the change at the negative electrode? [me-43]
Al3+ + 3e- ==> Al
2O2- - 4e- ==> O2
Al+ + e- ==> Al
2O2- - 2e- ==> O2
In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which is the correct equation to show the change at the positive electrode? [me-44]
Al3+ + 3e- ==> Al
2O2- - 4e- ==> O2
Al+ + e- ==> Al
2O2- - 2e- ==> O2
In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which word describes the process happening on the surface of the positive electrode? [me-45]
electrolysis
decomposition
oxidation
reduction
In the extraction of aluminium by electrolysis of molten aluminium oxide, all the chemical changes occur on the surface of the electrodes. The formula for aluminium oxide is Al2O3. Which word describes the process happening on the surface of the negative electrode? [me-46]
electrolysis
decomposition
oxidation
reduction
Copper is purified by the electrolysis of copper(II)
sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II)
sulfate is CuSO4. Which word describes the process happening on the surface of the positive electrode? [me-47]
electrolysis
decomposition
oxidation
reduction
Copper is purified by the electrolysis of copper(II)
sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II)
sulfate is CuSO4. Which word describes the process happening on the surface of the negative electrode? [me-48]
electrolysis
decomposition
oxidation
reduction
Copper is purified by the electrolysis of copper(II)
sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II)
sulfate is CuSO4. Which equation correctly describes the process happening on the surface of the positive electrode? [me-49]
2H+(aq) + 2e- ==> H2(aq)
2O2- - 4e- ==> O2
Cu(s) - 2e- ==> Cu2+(aq)
Cu2+(aq) + 2e- ==> Cu(s)
Copper is purified by the electrolysis of copper(II)
sulfate solution using copper electrodes. All the chemical changes occur on the surface of the electrodes. The formula for copper(II)
sulfate is CuSO4. Which equation correctly describes the process happening on the surface of the negative electrode? [me-50]
2H+(aq) + 2e- ==> H2(aq)
2O2- - 4e- ==> O2
Cu(s) - 2e- ==> Cu2+(aq)
Cu2+(aq) + 2e- ==> Cu(s)
Which is TRUE about the extraction of aluminium by electrolysis? [me-75]
aluminium ions move to the positive electrode and are oxidised to aluminium atoms by electron loss
oxide ions move to the positive electrode and are reduced by electron gain
aluminium ions move to the negative electrode and are reduced to aluminium atoms by electron gain
oxide ions move to the negative electrode and are oxidised by electron loss
Which is TRUE about the extraction of aluminium by electrolysis? [me-76]
aluminium ions move to the negative electrode and are oxidised to aluminium atoms by electron loss
oxide ions move to the negative electrode and are reduced by electron gain
aluminium ions move to the positive electrode and are reduced to aluminium atoms by electron gain
oxide ions move to the positive electrode and are oxidised by electron loss
The diagram shows how copper is purified by electrolysis. What happens at the negative electrode? [me-95]
copper ions gain electrons to become neutral copper atoms
neutral copper atoms lose electrons to become ions
neutral copper atoms gain electrons to become ions
copper ions lose electrons to become neutral atoms
The diagram shows how copper is purified by electrolysis. What happens at the positive electrode? [me-96]
copper ions gain electrons to become neutral copper atoms
neutral copper atoms lose electrons to become ions
neutral copper atoms gain electrons to become ions
copper ions lose electrons to become neutral atoms
The diagram shows how copper is purified by electrolysis. Which is a suitable salt to use? [me-97]
aluminium
sulfate
sodium chloride
copper
sulfate
magnesium chloride
Electrolysis processes can only be done on solutions or molten materials because? [me-98]
less energy is needed
the product might be a gas, liquid or a solid
electrons cannot flow through solids
the ions must free to move to electrodes
In an electrolysis process which word describes the overall chemical change? [me-99]
redox
oxidation
reduction
neutralisation
In an electrolysis process which word describes the change at the positive electrode? [me-100]
redox
oxidation
reduction
neutralisation
In an electrolysis process which word describes the change at the negative electrode? [me-101]
redox
oxidation
reduction
neutralisation
Sodium and chlorine can be manufactured by passing a direct current through the molten salt sodium chloride. What happens at the negative electrode? [me-102]
chloride ions lose electrons and become chlorine atoms (which form molecules)
sodium atoms lose electrons and become sodium ions
chlorine atoms gain electrons and become chloride ions
sodium ions gain electrons and become sodium atoms
Sodium and chlorine can be manufactured by passing a direct current through the molten salt sodium chloride. What happens at the positive electrode? [me-103]
chloride ions lose electrons and become chlorine atoms (which form molecules)
sodium atoms lose electrons and become sodium ions
chlorine atoms gain electrons and become chloride ions
sodium ions gain electrons and become sodium atoms
Sodium and chlorine can be manufactured by passing a direct current through the molten salt sodium chloride. What happens to the sodium ions is an example of? [me-104]
displacement
reduction
oxidation
decomposition
Sodium and chlorine can be manufactured by passing a direct current through the molten salt sodium chloride. What happens to the chloride ion is an example of? [me-105]
displacement
reduction
oxidation
decomposition
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Which metal is less reactive than copper? [mr-1]
Which is formed when a metal reacts with cold water? [mr-5]
Which is formed when a heated metal reacts with steam? [mr-8]
Which of these in contact with iron will cause rusting? [mr-29]
Aluminium window frames do not corrode away because the aluminium is? [mr-63]
When copper is heated in air, the oxide compound formed is ? in colour. [mr-92]
Galvanising means coating an iron (Fe) or steel object with a layer of zinc (Zn) to protect it from corrosion. Steel cans can also be coated with tin (Sn), also to protect it from corrosion, including fruit juices in 'tin' cans. When the zinc coating is scratched through to the iron underneath, the iron still does not corrode
initially. However, if the tin surface is scratched through to the iron, the iron corrodes even faster compared to when there was no coating at. This means? [mr-103]
This means a chemical reaction is? [am-1]
C + D
The equation shows the effect of heat on the salt ammonium chloride. Which statement is TRUE about this reversible reaction? [am-9]
The equation shows the effect of heat on the salt hydrated copper(II)
sulfate. Which statement is TRUE about this reversible reaction? [am-14]
The 
Which is TRUE about reversible reactions that have formed a chemical equilibrium? [am-93]
The equation above shows the making of hydrogen from methane (natural gas) and steam, for the manufacture of ammonia in the Haber Process. For every mole of methane reacted, 206 kJ of heat energy is absorbed (taken in) in forming the three moles of hydrogen. Which is TRUE about this reaction? [am-97]
Which reaction is causes the high temperature in a blast furnace? [me-9]
To produce aluminium, electricity is passed through? [me-31]
After the initial chemical extraction of copper from a copper ore, the copper is purified by? [me-51]
Which metals is obtained from bauxite ore? [me-67]
Which statement is TRUE? [me-71]
Which metal is found as the free element in the Earth's crust? [me-79]
Electrolysis processes can only be done on solutions or molten materials because? [me-98]
Sodium and chlorine can be manufactured by passing a direct current through the molten salt sodium chloride. What happens at the negative electrode? [me-102]