Heat is taken in when ammonium nitrate dissolves in water. This is an example of? [et-1]
electrolysis
endothermic charge
exothermic change
thermal decomposition
Change 1. When calcium carbonate forms calcium oxide and carbon dioxide heat is absorbed. Change 2. Calcium oxide releases heat when shaken with carbon dioxide. Which line BEST describes these changes? [et-2]
change 1 is endothermic; change 2 is exothermic
change 1 is exothermic; change 2 is endothermic
change 1 is exothermic; change 2 is exothermic
change 1 is endothermic; change 2 is endothermic
When sodium hydroxide dissolves in water the temperature rises. This is an example of? [et-3]
electrolysis
endothermic charge
exothermic change
thermal decomposition
The breaking of bonds in a chlorine molecule must be? [et-4]
electrolytic
endothermic
equilibrium
exothermic
The making of bonds in forming a hydrogen molecule from hydrogen atoms must be? [et-5]
electrolytic
endothermic
equilibrium
exothermic
Change 1. Water is added to blue cobalt chloride, it turns pink and heats up. Change 2. When pink cobalt chloride is heated, water is driven off, it turns blue and takes in heat. Which line BEST describes these changes? [et-12]
change 1 is endothermic; change 2 is endothermic
change 1 is exothermic; change 2 is exothermic
change 1 is exothermic; change 2 is endothermic
change 1 is endothermic; change 2 is exothermic
Which of the following statements BEST explains why a chemical reaction involving a catalyst goes faster than without the catalyst? [et-22]
the catalyst decreases the energy of collisions between reactant particles
the catalyst increases the frequency of collisions between reactant particles
the catalyst decreases the activation energy for the reaction
the catalyst increases the activation energy for the reaction
Which of the following statements BEST explains why a chemical reaction goes slower without a suitable catalyst? [et-23]
the catalyst increases the energy of collisions between reactant particles
the catalyst increases the frequency of collisions between reactant particles
the activation energy is higher for the catalysed reaction
the activation energy is higher for the uncatalysed reaction
When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as? [et-24]
a decomposition
endothermic
exothermic
activated
When magnesium dissolves in hydrochloric acid the temperature rises. The type of energy change is described as? [et-25]
a decomposition
endothermic
exothermic
activated
The reaction between
sulfuric acid and zinc is exothermic. During the reaction, which observation is correct? [et-26]
a precipitate forms
the temperature of the solution decreases
the temperature of the solution does not change
the temperature of the solution rises
Which of these processes is always exothermic? [et-27]
burning
evaporation
insulation
melting
Which of these processes is always exothermic? [et-28]
combustion
evaporation
insulation
melting
Which of these process is always endothermic? [et-29]
burning
condensation
evaporation
freezing
Which of these process is always endothermic? [et-30]
burning
condensation
freezing
melting
Which of these process is always endothermic? [et-31]
burning
boiling
condensation
freezing
Which of these process is always exothermic? [et-32]
boiling
condensing
evaporation
melting
Which of these process is always exothermic? [et-33]
boiling
evaporating
freezing
melting
The chemical change when a fuel burns can be described as? [et-34]
an endothermic reaction
an exothermic reaction
a precipitation
a reversible reaction
When ammonium nitrate is added to water, an endothermic reaction occurs and? [et-35]
heat is given out
the surroundings get hotter
the temperature falls
the temperature rises
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most exothermic? [et-36]
temperature rises by 3oC
temperature rises by 5oC
temperature falls by 3oC
temperature falls by 5oC
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the most endothermic? [et-37]
temperature rises by 3oC
temperature rises by 5oC
temperature falls by 3oC
temperature falls by 5oC
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the least exothermic? [et-38]
temperature rises by 3oC
temperature rises by 5oC
temperature falls by 3oC
temperature falls by 5oC
Equal amounts of four different substances (A-D) where added separately to equal amounts of an acid and a thermometer placed in the mixture. For which substance is the reaction the least endothermic? [et-39]
temperature rises by 3oC
temperature rises by 5oC
temperature falls by 3oC
temperature falls by 5oC
Which of the following energy changes corresponds to the activation energy required for the forward reaction to take place? [et-40]
energy change 1
energy change 2
energy change 3
energy change 4
Which of the following energy changes corresponds to the overall energy change for the reaction? [et-42]
energy change 1
energy change 2
energy change 3
energy change 4
Which of the following energy changes corresponds to the activation energy required for the forward reaction to take place? [et-43]
energy change 1
energy change 2
energy change 3
energy change 4
Which of the following energy changes corresponds to the overall energy change for the reaction? [et-45]
energy change 1
energy change 2
energy change 3
energy change 4
When an exothermic reaction takes place, the reaction mixture gets hotter because? [et-46]
energy is always released in a chemical change which makes new substances
exothermic changes always produce gases
in an exothermic change the products are less stable than the reactants
more energy is released when new bonds are made than is needed to break existing bonds
When an exothermic reaction takes place, the reaction mixture gets hotter because? [et-47]
energy is always released in a chemical change which makes new substances
exothermic changes always produce gases
in an exothermic change the products are more stable than the reactants
more energy is absorbed when new bonds are made than is needed to break existing bonds
When an endothermic reaction takes place, the reaction mixture takes in heat because? [et-48]
energy is always absorbed in a chemical change which makes new substances
endothermic changes always produce energy
in an endothermic change the products are more stable than the reactants
more energy is absorbed when existing bonds are broken than is given out when new bonds are formed in the products
When an endothermic reaction takes place, the reaction mixture takes in heat because? [et-49]
energy is always absorbed in a chemical change which makes new substances
endothermic changes always produce energy
in an endothermic change the products are less stable than the reactants
more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken
Energy is needed to make a mixture of methane and oxygen react. The mixture explodes when a lighted splint is applied. What type of energy is supplied by the splint? [et-50]
Activation energy
Catalyst energy
Kinetic energy
Renewable energy
Which of these involves a chemical reaction? [et-82] 1. baking bread : 2. boiling water : 3. corroding metals
1 and 2
1 and 3
2 and 3
All of them
Which of the following is a chemical change? [et-83]
cooling a cup of tea
dissolving sugar in coffee
lighting a match
melting an ice-cube
Which of the following is a physical change? [et-84]
dissolving sugar in coffee
lighting a match
making lime from limestone
making polythene from gaseous oil molecules
Which of the following involves a chemical reaction? [et-85]
cooking a cake
filtering sand from water
fractionally distilling oil
melting ice
Which of the following results in a chemical reaction? [et-86]
adding vinegar to water
leaving milk to go sour
mixing salt with water
stirring sugar with tea
Which of these involves a chemical reaction? [et-87]
apples decaying
ice melting
magnetising iron
boiling water
Which of these involves a physical change and NOT a chemical reaction? [et-88]
apples decaying
frying bacon
iron rusting
boiling water
Which of these involves a physical change and NOT a chemical reaction? [et-89]
apples decaying
frying bacon
iron rusting
freezing water
Which of these involves a chemical reaction? [et-90]
crushing apples
toasting bread
magnetising iron
freezing water
Which of these results in chemical change? [et-91]
adding lime to vinegar
adding milk to tea
mixing salt with water
mixing iron and
sulfur powders
Which of these results ONLY in a physical change? [et-92]
adding lime to vinegar
leaving bread to go mouldy
mixing salt with water
adding magnesium to hydrochloric acid
Which of the following temperature changes is NOT the result of a chemical change? [et-93]
a fall in temperature as liquid metal cools to solidify
a fall in temperature as a precipitate falls
a rise in temperature as neutralisation takes place
a rise in temperature when a fuel burns
Which of the following statements best describes the arrangement of particles in a gas? [sm-1]
Close together and stationary
Close together and vibrating
Far apart and moving slowly
Very far apart and moving quickly
Which of the following statements best describes the arrangement of particles in a solid? [sm-2]
Close together and stationary
Close together and vibrating
Far apart and moving slowly
Very far apart and moving quickly
Which of the following statements best describes the arrangement of particles in a liquid? [sm-3]
Close together and stationary
Far apart and vibrating
Close together and moving freely
Very far apart and moving quickly
Which of the following best describes what happens to the particles of water when it freezes? [sm-4]
They gain energy and break up into atoms of hydrogen and oxygen,
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of ice when it melts? [sm-5]
They gain energy and break up into atoms of hydrogen and oxygen,
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water when it boils? [sm-6]
They gain kinetic energy and increase their freedom to move without significant attraction
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water vapour when it condenses? [sm-7]
They gain kinetic energy and increase their freedom to move without significant attraction
They gain energy and gain freedom to move about
They lose energy and are closer and less free to move around
They lose energy and lose freedom to move about,
Which of the following best describes what happens to the particles of water when it evaporates? [sm-8]
The higher kinetic energy particles increase their freedom to move without significant attraction
They gain energy and gain freedom to move about
They lose energy and escape into the atmosphere
They lose energy and lose freedom to move about,
The table shows the melting points and boiling points of some substances. Which substance is a solid at 25oC? [sm-9]
[Substance] Melting Point oC and Boiling Point oC
-39 and 354
119 and 446
15 and 126
-127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 0oC? [sm-10]
[Substance] Melting Point oC and Boiling Point oC
-39 and 354
119 and 446
15 and 126
-127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a gas at 0oC? [sm-11]
[Substance] Melting Point oC and Boiling Point oC
-39 and 354
119 and 446
15 and 126
-127 and -33
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 30oC? [sm-12]
[Substance] Melting Point oC and Boiling Point oC
-39 and 10
119 and 446
15 and 126
-127 and -33
Air is confined in a glass bottle with a tight screw-top. When the bottle becomes warmer when heated with a hair-dryer, the pressure inside increases because the molecules of air? [sm-13]
become bigger
become smaller
move faster
move slower
Air is in a glass bottle with a tight screw-top. When the bottle becomes cooler when placed in a refrigerator, the pressure inside decreases because the molecules of air? [sm-14]
become bigger
become smaller
move faster
move slower
When the air in a room becomes warmer a hanging balloon blown up with air becomes bigger because the molecules of air? [sm-15]
become bigger
become smaller
move faster
move slower
When the air in a room becomes cooler a hanging balloon blown up with air becomes smaller because the molecules of air? [sm-16]
become bigger
become smaller
move faster
move slower
The table shows the melting points and boiling points of some substances. Which substance is a liquid at 20 oC? [sm-17]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a solid at 20oC? [sm-18]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a gas at -60oC? [sm-19]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
The table shows the melting points and boiling points of some substances. Which substance is a liquid at -10oC and a gas at 10oC? [sm-20]
[Substance] Melting Point oC and Boiling Point oC
-142 and -78
-95 and 4
-66 and 42
90 and 189
Which of the following graphs represents how the temperature of liquid varies as it becomes a solid? [sm-21]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of gas varies as it becomes a liquid? [sm-22]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of solid varies as it becomes a liquid? [sm-23]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of liquid varies as it becomes a gas? [sm-24]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of gas varies as it eventually becomes a solid? [sm-25]
graph 1
graph 2
graph 3
graph 4
Which of the following graphs represents how the temperature of solid varies as it eventually becomes a gas? [sm-26]
graph 1
graph 2
graph 3
graph 4
Which of the following is true as a gas is changing to a liquid in condensation? [sm-27]
increase in particle order
temperature rises
particles gain more freedom
energy change is endothermic
Which of the following is true as a gas is changing to a liquid in condensation? [sm-28]
decrease in particle order
temperature rises
particles lose freedom
energy change is endothermic
Which of the following is true as a gas is changing to a liquid in condensation? [sm-29]
decrease in particle order
temperature rises
particles gain freedom
energy change is exothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-30]
increase in particle order
temperature falls
particles gain freedom
energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-31]
decrease in particle order
temperature stays constant
particles gain freedom
energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-32]
decrease in particle order
temperature falls
particles lose freedom
energy change is endothermic
Which of the following is true as a liquid changes to a solid in freezing? [sm-33]
decrease in particle order
temperature falls
particles gain freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-34]
decrease in particle order
temperature rises
particles lose freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-35]
increase in particle order
temperature stays constant
particles lose freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-36]
increase in particle order
temperature rises
particles gain freedom
energy change is exothermic
Which of the following is true as a solid changes to a liquid in melting? [sm-37]
increase in particle order
temperature rises
particles lose freedom
energy change is endothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-38]
decrease in particle order
temperature rises
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-39]
increase in particle order
temperature stays constant
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-40]
increase in particle order
temperature rises
particles gain freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in boiling? [sm-41]
increase in particle order
temperature rises
particles lose freedom
energy change is endothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-42]
decrease in particle order
temperature stays constant
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-43]
increase in particle order
temperature falls
particles lose freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-44]
increase in particle order
temperature stays constant
particles gain freedom
energy change is exothermic
Which of the following is true as a liquid changes to a gas in evaporation? [sm-45]
increase in particle order
temperature stays constant
particles lose freedom
energy change is endothermic
When water vapour in a cloud is gradually cooled, rainwater is formed. This change of state is called? [sm-46]
condensation
distillation
evaporation
saturation
Heat from the Sun changes water from liquid to a gas. This change of state is called? [sm-47]
condensation
distillation
evaporation
saturation
Gases diffuse because they? [sm-48]
are made of rapidly moving particles
have low boiling points
have a low density
easily move as convection currents
Liquids and dissolving solids diffuse because they? [sm-49]
are made of moving particles
have low boiling points
have a low density
easily move as convection currents
The table below shows the melting points and boiling points of substances A to D. Which substance is a gas at 25oC? [sm-50]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 354 oC
mpt = 63o, bpt = 760 oC
mpt = 119o, bpt = 446 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a liquid at 25oC? [sm-51]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 354 oC
mpt = 63o, bpt = 760 oC
mpt = 119o, bpt = 446 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a solid at 100oC? [sm-52]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 354 oC
mpt = 63o, bpt = 760 oC
mpt = 119o, bpt = 446 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is a solid at 100oC? [sm-53]
[Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = -127o, bpt = -33 oC
mpt = -39o, bpt = 154 oC
mpt = 99o, bpt = 140 oC
mpt = 101o, bpt = 110 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range 10oC to 90oC? [sm-54] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = 20o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range -120oC to 20oC? [sm-55] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = -40o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range 0oC to 100oC? [sm-56] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = -40o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The table below shows the melting points and boiling points of substances A to D. Which substance is suitable to use in a thermometer that measures in the range -4oC to 50oC? [sm-57] [Substance] Melting point oC(mpt), Boiling Point oC(bpt)
mpt = 0o, bpt = 100 oC
mpt = -200o, bpt = 40 oC
mpt = 40o, bpt = 350 oC
mpt = -110o, bpt = 80 oC
The rate of evaporation of a water does NOT depend on the? [sm-58]
humidity of the surrounding air
depth of the water
surface area of the water
temperature of the water
Which is true about the rate of evaporation of water? [sm-59]
it is speeded up on a humid day
it is due to the escape of the most energetic particles
heat is given out in the process
it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-60]
it is speeded up on a dry day
it is due to the escape of the least energetic particles
heat is given out in the process
it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-61]
it is speeded up on a humid day
it is due to the escape of the least energetic particles
heat is absorbed in the process
it is slowed down in a breeze
Which is true about the rate of evaporation of water? [sm-62]
it is speeded up on a humid day
it is due to the escape of the least energetic particles
heat is given out in the process
it is speeded up on a breezy day
Which of these statements is true about evaporation? [sm-63]
it is speeded up on a warm day
it is due to the escape of the least energetic particles
heat is given out in the process
it is speeded up on a humid day
The body is cooled down by sweating. This process mainly involves the heat transfer process of? [sm-64]
conduction
convection
evaporation
radiation
Which of the following describes heat transfer due to evaporation? [sm-65]
transfer due to the movement of volumes of gases or liquids
transfer due to loss of energetic particles from the surface of a liquid
transfer by infrared waves which can pass through air
transfer due to the vibration of particles in contact with each other
Which of the following best explains why gases diffuse throughout a container? [sm-66]
there are no attractive forces between the particles of a gas
gases have a low density
gas particles move fast
gas particles are very small
Which of the following best explains why gases have a low density? [sm-67]
the gas particles are very small
the particles are far apart
gas particles move fast
the attractive force between particles are very weak
Given the following symbol equation: 2Mg + O2 ==> 2MgO Calculate how many g of magnesium oxide is formed by burning 24g of magnesium in air. (Relative atomic masses, Ar: Mg = 24 and O = 16) [com-1]
40
16
20
80
Given the following symbol equation: 2Mg + O2 ==> 2MgO Calculate how many tonne of magnesium is needed to make 80 tonne of magnesium oxide. (Relative atomic masses, Ar: Mg = 24 and O = 16) [com-2]
96
48
24
16
Given the following symbol equation: CaCO3(s) ==> CaO(s) + CO2(g) Calculate how many kg of calcium carbonate is needed to make 56 kg of calcium oxide. (Relative atomic masses, Ar: Ca = 40, C = 12 and O = 16) [com-3]
50
44
100
40
Given the following symbol equation: CaCO3(s) ==> CaO(s) + CO2(g) Calculate how many g of carbon dioxide is formed if 25g of calcium carbonate is decomposed on heating to form 14g of calcium oxide. (Relative atomic masses, Ar: Ca = 40, C = 12 and O = 16) [com-4]
22
44
10
11
Given the symbol equation to show the formation of iron
sulfide: Fe + S ==> FeS Calculate the mass in g of iron sulfide formed when 5.6g of iron combines with 3.2g of
sulfur. (Relative atomic masses, Ar: Fe = 56 and S = 32) [com-5]
8.8
2.4
5.6
3.2
Given the symbol equation to show the formation of iron
sulfide: Fe + S ==> FeS Calculate the mass in g of iron sulfide formed when 28g of iron combines with 16g of
sulfur. (Relative atomic masses, Ar: Fe = 56 and S = 32) [com-6]
12
44
28
16
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine: Ca(s) + Cl2(g) ==> CaCl2(s) Calculate the mass in g of calcium chloride formed when 20g of calcium combines with 35.5g of chlorine. (Relative atomic masses, Ar: Ca = 40 and Cl = 35.5) [com-7]
15.5
70.0
55.5
17.5
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine: Ca(s) + Cl2(g) ==> CaCl2(s) Calculate the mass in g of chlorine needed when 40g of calcium forms 111g of calcium chloride. (Relative atomic masses, Ar: Ca = 40 and Cl = 35.5) [com-8]
80
100
151
71
Given the symbol equation to show the formation of aluminium
sulfide by heating a mixture of aluminium and sulfur: 2Al + 3S ==> Al2S3 How many g of
sulfur is needed if 54g of aluminium is reacted to form 150g of aluminium
sulfide? (Relative atomic masses, Ar: Al = 27 and S = 32) [com-9]
96
204
64
27
Given the symbol equation to show the formation of aluminium
sulfide by heating a mixture of aluminium and sulfur: 2Al + 3S ==> Al2S3 How many kg of
sulfur is needed if 108kg of aluminium is reacted to form 300kg of aluminium
sulfide? (Relative atomic masses, Ar: Al = 27 and S = 32) [com-10]
408
192
96
32
Given the symbol equation to show the formation of iron
sulfide by heating a mixture of iron and sulfur: Fe + S ==> FeS Calculate the mass in g of iron unreacted when 60g of iron reacts with 32g of
sulfur to form 88g of iron sulfide. (Relative atomic masses, Ar: Fe = 56 and S = 32) [com-11]
8
32
4
56
Given the symbol equation to show the formation of iron
sulfide by heating a mixture of iron and sulfur: Fe + S ==> FeS Calculate the mass in g of
sulfur unreacted when 28g of iron reacts with 22g of sulfur to form 44g of iron
sulfide. (Relative atomic masses, Ar: Fe = 56 and S = 32) [com-12]
22
16
12
6
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine: Ca(s) + Cl2(g) ==> CaCl2(s) Calculate the mass in g of calcium left unreacted when 25g of calcium reacts with 35.5g of chlorine. (Relative atomic masses, Ar: Ca = 40 and Cl = 35.5) [com-13]
10.5
5.0
7.1
12.5
Given the symbol equation to show the formation of calcium chloride by burning calcium in chlorine: Ca(s) + Cl2(g) ==> CaCl2(s) Calculate the mass in g of chlorine left unreacted when 80g of calcium reacts with 150g of chlorine to form 222g of calcium chloride. (Relative atomic masses, Ar: Ca = 40 and Cl = 35.5) [com-14]
70
8
16
72
Given the following relative atomic masses: Cu = 64, S = 32 and O = 16; calculate the relative formula mass of copper
sulfate, CuSO4 [rfm-1]
160
112
96
336
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of ethane, C2H6 [rfm-2]
13
30
18
25
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of octane, C8H18 [rfm-3]
13
96
114
112
Given the following relative atomic masses: H = 1, N = 14 and O = 16; calculate the relative formula mass of nitric acid, HNO3 [rfm-4]
31
93
62
63
Given the following relative atomic masses: H = 1, N = 14 and O = 16; calculate the relative formula mass of ammonium nitrate, NH4NO3 [rfm-5]
80
31
90
180
Given the following relative atomic masses: H = 1, N = 14, O = 16 and S = 32; calculate the relative formula mass of ammonium
sulfate, (NH4)2SO4 [rfm-6]
63
132
216
100
Given the following relative atomic masses: H = 1, O = 16 and S = 32; calculate the relative formula mass of
sulfuric acid, H2SO4 [rfm-7]
49
194
98
66
Given the following relative atomic masses: O = 16, Al = 27 and S = 32; calculate the relative formula mass of aluminium
sulfate, Al2(SO4)3 [rfm-8]
75
315
171
342
Given the following relative atomic masses: H = 1 and Cl = 35.5, calculate the relative formula mass of hydrochloric acid, HCl [rfm-9]
36.5
18
35.5
37.5
Given the following relative atomic masses: Na = 23 and Cl = 35.5, calculate the relative formula mass of sodium chloride, NaCl [rfm-10]
40
58.5
49.5
35
Given the following relative atomic masses: Ca = 40 and Cl = 35.5, calculate the relative formula mass of calcium chloride, CaCl2 [rfm-11]
75.5
151
111
146.5
Given the following relative atomic masses: H = 1, O = 16 and Mg = 24, calculate the relative formula mass of magnesium hydroxide, Mg(OH)2 [rfm-12]
41
82
42
58
Given the following relative atomic masses: Al = 27 and Cl = 35.5, calculate the relative formula mass of aluminium chloride, AlCl3 [rfm-13]
133.5
62.5
187.5
98
Given the following relative atomic masses: H = 1, O = 16 and Al = 27, calculate the relative formula mass of aluminium hydroxide, Al(OH)3 [rfm-14]
44
78
132
46
Given the following relative atomic masses: H = 1, C = 12 and O = 16; calculate the relative molecular mass of glucose, C6H12O6 [rfm-5]
29
40
180
90
Given the following relative atomic masses: H = 1, C = 12 and O = 16; calculate the relative molecular mass of ethanol ('alcohol'), C2H5OH [rfm-16]
29
23
41
46
Given the following relative atomic masses: H = 1, C = 12 and O = 16; calculate the relative molecular mass of ethanoic acid ('acetic acid'), CH3COOH [rfm-17]
60
29
84
58
Given the following relative atomic masses: O = 16 and Fe = 56; calculate the relative formula mass of iron(II) oxide, FeO [rfm-18]
40
72
56
16
Given the following relative atomic masses: O = 16 and Fe = 56; calculate the relative formula mass of iron(III) oxide, Fe2O3 [rfm-19]
72
200
160
216
Given the following relative atomic masses: O = 16 and Fe = 56; calculate the relative formula mass of the iron oxide, Fe3O4 [rfm-20]
72
272
174
232
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of methane, CH4 [rfm-21]
16
13
52
10
Given the following relative atomic masses: H = 1 and C = 12; calculate the relative molecular mass of propane, C3H8 [rfm-22]
13
44
99
40
Given the following relative atomic masses: C = 12 and O = 16; calculate the relative molecular mass of carbon dioxide, CO2 [rfm-23]
28
56
44
14
Given the following relative atomic masses: C = 12, O = 16 and Cu = 64; calculate the relative formula mass of copper carbonate, CuCO3 [rfm-24]
92
276
148
124
Given the following relative atomic masses: C = 12, O = 16 and Ca = 40; calculate the relative formula mass of calcium carbonate, CaCO3 [rfm-25]
100
68
204
124
Which of the following is a test for hydrogen gas? [gt1]
Gives a squeaky pop with a lit splint.
Relights a glowing red splint.
Turns blue litmus red then bleaches it white.
Turns red litmus paper blue
Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for oxygen gas? [gt2]
Gives a squeaky pop with a lit splint.
Relights a glowing red splint.
Turns blue litmus red then bleaches it white.
Turns red litmus paper blue
Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for chlorine gas? [gt3]
Gives a squeaky pop with a lit splint.
Relights a glowing red splint.
Turns blue litmus red then bleaches it white.
Turns red litmus paper blue
Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for ammonia gas? [gt4]
Gives a squeaky pop with a lit splint.
Relights a glowing red splint.
Turns blue litmus red then bleaches it white.
Turns red litmus paper blue
Gives a milky white precipitate with limewater (calcium hydroxide solution).
Which of the following is a test for carbon dioxide gas? [gt5]
Gives a squeaky pop with a lit splint.
Relights a glowing red splint.
Turns blue litmus red then bleaches it white.
Turns red litmus paper blue
Gives a milky white precipitate with limewater (calcium hydroxide solution).
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