Edexcel GCSE 9-1 Chemistry/Science QUIZ TOPIC 7 "Rates of reaction and energy changes" (FT)

For reactions to occur, the particles of the reactants must collide. The fewer the collisions that take place, the slower the rate of a reaction. Which DECREASES the frequency of collision between reactant particles? [rr-1]
1. For reactions involving gaseous reactants, decrease the pressure of the gases
2. For reactions involving solutions, raise the concentration of the solution
3. If a solid is reacting with a liquid, break the solid into smaller pieces
4. Raise the temperature of the reaction mixture
For reactions to occur, the particles of the reactants must collide. The fewer the collisions that take place, the slower the rate of reaction. Which DECREASES the frequency of collision between reactant particles? [rr-2]
1. For reactions involving gaseous reactants, increase the pressure of the gases
2. For reactions involving solutions, decrease the concentration of the solution
3. If a solid is reacting with a liquid, break the solid into smaller pieces
4. Raise the temperature of the reaction mixture
For reactions to occur, the particles of the reactants must collide. The fewer the collisions that take place, the slower the rate of reaction. Which INCREASES the frequency of collision between reactant particles? [rr-3]
1. For reactions involving gaseous reactants, decrease the pressure of the gases
2. For reactions involving solutions, decrease the concentration of the solution
3. If a solid is reacting with a liquid, break the solid into smaller pieces
4. Lower the temperature of the reaction mixture
For reactions to occur, the particles of the reactants must collide. The fewer the collisions that take place, the slower the rate of reaction. Which INCREASES the frequency of collision between reactant particles? [rr-4]
1. For reactions involving gaseous reactants, decrease the pressure of the gases
2. For reactions involving solutions, decrease the concentration of the solution
3. If a solid is reacting with a liquid, use large pieces of the solid
4. Increase the temperature of the reaction mixture
Calcium carbonate in the form of limestone dissolves in hydrochloric acid and giving off carbon dioxide gas. Which conditions would produce the fastest reaction? [rr-5]
1. temperature of 40°C and 10cm³ of dilute acid
2. temperature of 20°C and 10cm³ of dilute acid
3. temperature of 40°C and 5cm³ of dilute acid and 5cm³ of water
4. temperature of 20°C and 5cm³ of dilute acid and 5cm³ of water
Calcium carbonate in the form of limestone dissolves in hydrochloric acid and giving off carbon dioxide gas. Which conditions would produce the slowest reaction? [rr-6]
1. temperature of 40°C and 10cm³ of dilute acid
2. temperature of 20°C and 10cm³ of dilute acid
3. temperature of 40°C and 5cm³ of dilute acid and 5cm³ of water
4. temperature of 20°C and 5cm³ of dilute acid and 5cm³ of water
Iron reacts with hydrochloric acid to form iron(II) chloride and hydrogen gas. 2g of iron is added to 100cm³ of dilute hydrochloric acid. Which conditions produces the fastest reaction? [rr-7]
1. iron pieces at 25°C
2. iron pieces at 50°C
3. iron powder at 25°C
4. iron powder at 50°C
Iron reacts with hydrochloric acid to form iron(II) chloride and hydrogen gas. 2g of iron is added to 100cm³ of dilute hydrochloric acid. Which conditions produces the slowest reaction? [rr-8]
1. iron pieces at 25°C
2. iron pieces at 50°C
3. iron powder at 25°C
4. iron powder at 50°C
A group of students carried out an experiment in which they added manganese dioxide to rapidly decompose a solution of hydrogen peroxide. To show that the manganese dioxide was acting as a catalyst, what must they do before and after the experiment? [rr-9]
1. BEFORE: weigh the hydrogen peroxide solution and manganese dioxide in separate containers before mixing
  AFTER: weigh both of the containers again
2. BEFORE: weigh the hydrogen peroxide solution in a beaker and then add the manganese dioxide to the beaker
  AFTER: weigh the beaker and its contents
3. BEFORE: weigh the manganese dioxide and then add the hydrogen peroxide solution to the beaker
  AFTER: weigh the beaker and its contents
4. BEFORE: weigh the manganese dioxide and a dry filter paper
  AFTER: filter the solution, dry the filter paper and the solid residue, weigh the filter paper
When marble chips dissolve in acid, the reaction can be speeded up by? [rr-10]
1. grinding the marble chips
2. lowering the temperature
3. using a larger flask
4. using more dilute acid
When marble chips dissolve in acid, the reaction can be slowed down by? [rr-11]
1. grinding the marble chips
2. lowering the temperature
3. using a larger flask
4. using more dilute acid
Copper(II) oxide catalyses the decomposition of hydrogen peroxide to form oxygen.
In acting as a catalyst the copper(II) oxide? [rr-12]
1. causes the decomposition to begin
2. increases the total amount of oxygen formed
3. increases the rate at which oxygen is formed
4. prevents the decomposition of the oxygen formed
Which mixture will enable the fastest reaction to take place between solid calcium carbonate (marble chips) and dilute hydrochloric acid? [rr-13]
1. large chips, concentrated acid, low temperature
2. low temperature, small chips, dilute acid
3. concentrated acid, high temperature, small chips
4. high temperature, small chips, dilute acid
Which mixture will produce the slowest reaction to take place between solid calcium carbonate (marble chips) and dilute hydrochloric acid? [rr-14]
1. large chips, concentrated acid, low temperature
2. low temperature, large chips, dilute acid
3. concentrated acid, high temperature, small chips
4. high temperature, small chips, dilute acid
Platinum catalyses the reaction between sulfur dioxide SO₂ and oxygen O₂ to form sulfur trioxide SO₃. Which of the statements 1, 2 or 3 is/are correct? [rr-15]
1. more sulfur trioxide is formed when more catalyst is used
2. the catalyst increases the rate of reaction between sulfur dioxide and oxygen
3. when the reaction is complete the platinum catalyst has not lost any mass
1. 1 and 2
2. 1 and 3
3. 2 and 3
4. 1, 2 and 3
Platinum catalyses the reaction between sulfur dioxide SO₂ and oxygen O₂ to form sulfur trioxide SO₃. Which statement(s) 1, 2 or 3 is NOT correct? [rr-16]
1. less sulfur trioxide is formed when more catalyst is used
2. the catalyst decreases the rate of reaction between sulfur dioxide and oxygen
3. when the reaction is complete the platinum catalyst has gained mass
1. only 1
2. only 1 and 3
3. only 2 and 3
4. 1, 2 and 3
The rate of reaction between acid and marble chips can be decreased by? [rr-17]
1. warming
2. stirring
3. using larger chips
4. using more acid
A small quantity of marble chips is added to a large excess acid. Carbon dioxide gas is formed. Which will double the amount of carbon dioxide formed? [rr-18]
1. mass of acid
2. mass of marble chips
3. mass of water
4. volume of acid
Limestone reacts with hydrochloric acid to produce carbon dioxide. A student set up four experiments A to D. Which experiment would you expect to go the fastest? [rr-19]
1. limestone powder, dilute acid at 20°C
2. limestone lumps, dilute acid at 40°C
3. limestone lumps, concentrated acid at 20°C
4. limestone powder, concentrated acid at 40°C
Limestone reacts with hydrochloric acid to produce carbon dioxide. A student set up four experiments A to D. Which experiment would you expect to go the slowest? [rr-20]
1. limestone powder, dilute acid at 20°C
2. limestone lumps, dilute acid at 20°C
3. limestone lumps, concentrated acid at 40°C
4. limestone powder, concentrated acid at 40°C
A small quantity of calcium carbonate is added to a large excess acid. Carbon dioxide gas is formed. Which of the following will halve the amount of carbon dioxide formed? [rr-21]
1. doubling the temperature of the acid
2. doubling the volume of acid
3. halving the mass of the acid
4. halving the mass of the calcium carbonate
Sodium thiosulfate solution reacts with hydrochloric acid to form sodium chloride, sulfur dioxide, sulfur and water. The reaction can be followed by measuring the time it takes for enough of the sulfur precipitate to form to obscure a black cross marked on white paper. Which will decrease the time it takes for the black cross to disappear? [rr-22]
1. increase the concentration of the hydrochloric acid
2. decrease the concentration of the sodium thiosulfate
3. cool the mixture
4. add more water to the mixture
Sodium thiosulfate solution reacts with hydrochloric acid to form sodium chloride, sulfur dioxide, sulfur and water. The reaction can be followed by measuring the time it takes for enough of the sulfur precipitate to form to obscure a black cross marked on white paper. Which will decrease the time it takes for the black cross to disappear? [rr-23]
1. decrease the concentration of the hydrochloric acid
2. increase the concentration of the sodium thiosulfate
3. cool the mixture
4. add more water to the mixture
Sodium thiosulfate solution reacts with hydrochloric acid to form sodium chloride, sulfur dioxide, sulfur and water. The reaction can be followed by measuring the time it takes for enough of the sulfur precipitate to form to obscure a black cross marked on white paper. Which will decrease the time it takes for the black cross to disappear? [rr-24]
1. decrease the concentration of the hydrochloric acid
2. decrease the concentration of the sodium thiosulfate
3. heat the mixture
4. add more water to the mixture
An experiment was carried out at a temperature of 25^oC by dissolving 0.2g of small limestone granules into 30cm³ of hydrochloric acid. The acid concentration was 1.0 mol/dm³ and in excess so all the limestone dissolved. The reaction was followed by measuring the volume of carbon dioxide given off over a period of 6 minutes. A 2nd experiment was done in an identical manner but using 0.2g of limestone lumps. Which of the graphs W, X, Y or Z might you expect for the results? [rr-25]
1. graph line W
2. graph line X
3. graph line Y
4. graph line Z
An experiment was carried out at a temperature of 25^oC by dissolving 0.2g of small limestone granules into 30cm³ of hydrochloric acid. The acid concentration was 1.0 mol/dm³ and in excess so all the limestone dissolved. The reaction was followed by measuring the volume of carbon dioxide given off over a period of 6 minutes. A 2nd experiment was done in an identical manner but using 0.4g of the same limestone granules. Which of the graphs W, X, Y or Z might you expect for the results? [rr-26]
1. graph line W
2. graph line X
3. graph line Y
4. graph line Z
An experiment was carried out at a temperature of 25^oC by dissolving 0.2g of small limestone granules into 30cm³ of hydrochloric acid. The acid concentration was 1.0 mol/dm³ and in excess so all the limestone dissolved. The reaction was followed by measuring the volume of carbon dioxide given off over a period of 6 minutes. A 2nd experiment was done in an identical manner but using acid of 2.0mol/dm³ concentration. Which of the graphs W, X, Y or Z might you expect for the results? [rr-27]
1. graph line W
2. graph line X
3. graph line Y
4. graph line Z
An experiment was carried out at a temperature of 25^oC by dissolving 0.2g of small limestone granules into 30cm³ of hydrochloric acid. The acid concentration was 1.0 mol/dm³ and in excess so all the limestone dissolved. The reaction was followed by measuring the volume of carbon dioxide given off over a period of 6 minutes. A 2nd experiment was done in an identical manner but using 0.1g of the same limestone granules. Which of the graphs W, X, Y or Z might you expect for the results? [rr-28]
1. graph line W
2. graph line X
3. graph line Y
4. graph line Z
An experiment was carried out at a temperature of 25^oC by dissolving 0.2g of small limestone granules into 30cm³ of hydrochloric acid. The acid concentration was 1.0 mol/dm³ and in excess so all the limestone dissolved. The reaction was followed by measuring the volume of carbon dioxide given off over a period of 6 minutes. A 2nd experiment was done in an identical manner but at a temperature of 50^oC. Which of the graphs W, X, Y or Z might you expect for the results? [rr-29]
1. graph line W
2. graph line X
3. graph line Y
4. graph line Z
An experiment was carried out at a temperature of 25^oC by dissolving 0.2g of small limestone granules into 30cm³ of hydrochloric acid. The acid concentration was 1.0 mol/dm³ and in excess so all the limestone dissolved. The reaction was followed by measuring the volume of carbon dioxide given off over a period of 6 minutes. A 2nd experiment was done in an identical manner but using acid of 0.5mol/dm³ concentration. Which of the graphs W, X, Y or Z might you expect for the results? [rr-30]
1. graph line W
2. graph line X
3. graph line Y
4. graph line Z
Which will react the fastest with hydrochloric acid? [rr-31]
1. marble chips at 40^oC
2. marble chips at 25^oC
3. powdered marble at 40^oC
4. powdered marble at 25^oC
Which will react the slowest with hydrochloric acid? [rr-32]
1. marble chips at 40^oC
2. marble chips at 25^oC
3. powdered marble at 40^oC
4. powdered marble at 25^oC
An acid reacts with some tablets. The rate of reaction is decreased by? [rr-33]
1. cooling the tablets and the acid
2. crushing the tablets before adding the acid
3. stirring the tablets in the acid
4. using a more concentrated acid
A catalyst can increase the rate of a chemical reaction.
Which of the following is also TRUE about catalysts? [rr-34]
1. their appearance is unchanged at the end of the reaction
2. they have to be a metal
3. they have to be a solid
4. they are chemically the same at the end of the reaction
A large amount of calcium carbonate (excess) is added to a small amount of dilute hydrochloric acid. Which will double the volume of carbon dioxide finally formed? [rr-35]
1. doubling the mass of calcium carbonate
2. doubling the volume of the hydrochloric acid
3. halving the mass of the hydrochloric acid
4. doubling the temperature
A large amount of calcium carbonate (excess) is added to a small amount of dilute hydrochloric acid. Which will double the volume of carbon dioxide finally formed? [rr-36]
1. doubling the mass of calcium carbonate
2. halving the volume of the hydrochloric acid
3. doubling the temperature
4. doubling the concentration of the acid
A large amount of calcium carbonate (excess) is added to a small amount of dilute hydrochloric acid. Which will halve the volume of carbon dioxide finally formed? [rr-37]
1. halving the mass of calcium carbonate
2. halving the volume of the hydrochloric acid
3. halving the temperature
4. doubling the concentration of the acid
A large amount of calcium carbonate (excess) is added to a small amount of dilute hydrochloric acid. Which will halve the volume of carbon dioxide finally formed? [rr-38]
1. doubling the mass of calcium carbonate
2. doubling the volume of the hydrochloric acid
3. halving the temperature
4. halving the concentration of the acid
Potatoes cook more quickly in boiling vegetable oil than in boiling water. This is because oil? [rr-39]
1. boils at a higher temperature than water
2. catalyses the cooking process
3. contains water
4. replaces the water in the potatoes
In a rates experiment the following carbon dioxide gas volumes were recorded by a student resulting from an acid-limestone reaction. The gas volume of CO₂ formed at 1.5 min was omitted by accident.
time (min) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Vol (cm³) 0 8 15 ? 26 30 33 36 38 39 40 40 40
What is the most likely value of the missing reading in cm³ of carbon dioxide? [rr-40]
1. 18
2. 21
3. 23
4. 24
In a rates experiment the following carbon dioxide gas volumes were recorded by a student resulting from an acid-limestone reaction.
time (min) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Vol (cm³) 0 8 15 21 26 30 33 36 38 39 40 40 40
At what time did the reaction stop? [rr-41]
1. 4.5 min
2. 6.0 min
3. 5.0 min
4. 5.5 min
In a rates experiment the following carbon dioxide gas volumes were recorded by a student resulting from an acid-limestone reaction.
time (min) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Vol (cm³) 0 8 15 21 26 30 33 36 38 39 40 40 40
At what approximate time is the speed of the reaction 8cm³gas/min? [rr-42]
1. 2.0 to 2.5 min
2. 0.0 t0 0.5 min
3. 1.0 to 1.5 min
4. 5.0 to 5.5 min
A gas was produced in a chemical reaction. The total volume of gas formed was measured at regular time intervals. Which graph would you expect the results to be like? [rr-43]
1. graph Q
2. graph W
3. graph Y
4. graph Z
Which is a chemical test for the gas hydrogen? [rr-44]
1. pops with lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper
Which is a chemical test for the gas carbon dioxide? [rr-45]
1. pops with a lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper
Which is a chemical test for the gas oxygen? [rr-46]
1. pops with a lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper
Which is a chemical test for the gas chlorine? [rr-47]
1. pops with a lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper
Which of the following gases is formed when a metal reacts with an acid? [rr-48]
1. hydrogen
2. carbon dioxide
3. oxygen
4. chlorine
Which of the following gases is formed when an acid reacts with a carbonate? [rr-49]
1. hydrogen
2. carbon dioxide
3. oxygen
4. chlorine
Which of the following is formed when a metal reacts with an acid? [rr-50]
1. O₂
2. Cl₂
3. H₂
4. CO₂
Which of the following is formed when a carbonate reacts with an acid? [rr-51]
1. O₂
2. Cl₂
3. H₂
4. CO₂
A solid was produced in a chemical reaction. The total mass of solid formed was measured at regular time intervals. Which graph would you expect the results to be like? [rr-52]
1. graph Y
2. graph W
3. graph Q
4. graph Z
A solid and a liquid reacted to produce a solution. The mass of the solid reactant was measured at regular time intervals. Which graph would you expect the results to be like? [rr-53]
1. graph W
2. graph Q
3. graph Y
4. graph Z
Two solids were heated and reacted to form another solid. The total mass of the solids was measured at regular time intervals. Which graph would you expect the results to be like? [rr-54]
1. graph W
2. graph Q
3. graph Y
4. graph Z
On mixing two reacting solutions a solid precipitate was formed. The mass of the solid precipitate was measured at regular time intervals. Which graph would you expect the results to be like? [rr-55]
1. graph W
2. graph Q
3. graph Y
4. graph Z
Limestone chips were reacted with acid in a beaker placed on a one pan electric balance. The mass of the reacting mixture was measured at regular time intervals. Which graph would you expect the results to be like? [rr-56]
1. graph W
2. graph Q
3. graph Y
4. graph Z
An experiment was carried out to dissolve small limestone granules into hydrochloric acid. Carbon dioxide gas is formed and was collected in a gas syringe. The initial results are marked as the 'original experiment'. The experiment was repeated after varying the reaction conditions (ie mass of limestone, size of limestone pieces, temperature or acid concentration). The speed of the reaction can be given in cm³/min, ie the speed at which carbon dioxide is formed. Which experiment is going at an approximate average speed of 30 cm³/min in the first half minute of the reaction? [rr-57]
1. graph line for experiment W
2. graph line for experiment X
3. graph line for experiment Y
4. graph line for experiment Z
An experiment was carried out to dissolve small limestone granules into hydrochloric acid. Carbon dioxide gas is formed and was collected in a gas syringe. The initial results are marked as the 'original experiment'. The experiment was repeated after varying the reaction conditions (ie mass of limestone, size of limestone pieces, temperature or acid concentration). The speed of the reaction can be given in cm³/min, ie the speed at which carbon dioxide is formed. Which experiment is going at an approximate average speed of 22 cm³/min in the first half minute of the reaction? [rr-58]
1. graph line for experiment W
2. graph line for experiment X
3. graph line for experiment Y
4. graph line for experiment Z
An experiment was carried out to dissolve small limestone granules into hydrochloric acid. Carbon dioxide gas is formed and was collected in a gas syringe. The initial results are marked as the 'original experiment'. The experiment was repeated after varying the reaction conditions (ie mass of limestone, size of limestone pieces, temperature or acid concentration). The speed of the reaction can be given in cm³/min, ie the speed at which carbon dioxide is formed. Which experiment is going at an approximate average speed of 6 cm³/min in the first minute of the reaction? [rr-59]
1. graph line for experiment W
2. graph line for experiment X
3. graph line for experiment Y
4. graph line for experiment Z
An experiment was carried out to dissolve small limestone granules into hydrochloric acid. Carbon dioxide gas is formed and was collected in a gas syringe. The initial results are marked as the 'original experiment'. The experiment was repeated after varying the reaction conditions (ie mass of limestone, size of limestone pieces, temperature or acid concentration). The speed of the reaction can be given in cm³/min, ie the speed at which carbon dioxide is formed. Which experiment is going at an approximate average speed of 3 cm³/min in the first minute of the reaction? [rr-60]
1. graph line for experiment W
2. graph line for experiment X
3. graph line for experiment Y
4. graph line for experiment Z
What would you increase, to increase the kinetic energy of particles involved in a chemical reaction? [rsa-1]
What would you decrease, to decrease the kinetic energy of particles involved in a chemical reaction? [rsa-2]
What must particles do with each other before they can react? [rsa-3]
What do you increase to make two gases react together faster at the same temperature? [rsa-4]
What do you decrease to make two gases react together more slowly at the same temperature? [rsa-5]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). Which of 1 to 5 is seen as the 'fizzing'? [rsa-6]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). Which of 1 to 5 is the 'salt' in the reaction? [rsa-7]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). Which of 1 to 5 has the formula HCl? [rsa-8]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). Which of 1 to 5 has the formula CaCO₃? [rsa-9]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). Which of 1 to 5 has the formula CaCl₂? [rsa-10]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). In what form would you add the marble to speed up the reaction? [rsa-11]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). In what form would you add the marble to slow down the reaction? [rsa-12]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). What could you reduce for the acid to slow the reaction down at the same temperature? [rsa-13]
Limestone or marble chips are made of the chemical calcium carbonate (1). They both dissolve in hydrochloric acid (2), to produce a solution of calcium chloride (3), water (4) and carbon dioxide (5). What could you increase for the acid to speed up the reaction at the same temperature? [rsa-14]
Calcium carbonate (limestone) were dissolved in hydrochloric acid under five different experimental conditions.

The carbon dioxide gas formed was collected in a gas syringe and the total volume of gas was recorded for the first six minutes.

The speed or 'rate of reaction' can be expressed as the rate of formation of carbon dioxide in cm³/min.

What is the average speed of the reaction in experiment W between 1 and 2 minutes in cm³/min? [rsa-15]
Calcium carbonate (limestone) were dissolved in hydrochloric acid under five different experimental conditions.

The carbon dioxide gas formed was collected in a gas syringe and the total volume of gas was recorded for the first six minutes.

The speed or 'rate of reaction' can be expressed as the rate of formation of carbon dioxide in cm³/min.

What is the average speed of the reaction in experiment X in the first half minute in cm³/min? [rsa-16]
Heat is taken in when ammonium nitrate dissolves in water. This is an example of? [et-1]
1. electrolysis
2. endothermic charge
3. exothermic change
4. 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]
1. change 1 is endothermic; change 2 is exothermic
2. change 1 is exothermic; change 2 is endothermic
3. change 1 is exothermic; change 2 is exothermic
4. change 1 is endothermic; change 2 is endothermic
When sodium hydroxide dissolves in water the temperature rises. This is an example of? [et-3]
1. electrolysis
2. endothermic charge
3. exothermic change
4. thermal decomposition
The breaking of bonds in a chlorine molecule must be? [et-4]
1. electrolytic
2. endothermic
3. equilibrium
4. exothermic
The making of bonds in forming a hydrogen molecule from hydrogen atoms must be? [et-5]
1. electrolytic
2. endothermic
3. equilibrium
4. 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]
1. change 1 is endothermic; change 2 is endothermic
2. change 1 is exothermic; change 2 is exothermic
3. change 1 is exothermic; change 2 is endothermic
4. 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]
1. the catalyst decreases the energy of collisions between reactant particles
2. the catalyst increases the frequency of collisions between reactant particles
3. the catalyst decreases the activation energy for the reaction
4. 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]
1. the catalyst increases the energy of collisions between reactant particles
2. the catalyst increases the frequency of collisions between reactant particles
3. the activation energy is higher for the catalysed reaction
4. 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]
1. a decomposition
2. endothermic
3. exothermic
4. activated
When magnesium dissolves in hydrochloric acid the temperature rises. The type of energy change is described as? [et-25]
1. a decomposition
2. endothermic
3. exothermic
4. activated
The reaction between sulfuric acid and zinc is exothermic. During the reaction, which observation is correct? [et-26]
1. a precipitate forms
2. the temperature of the solution decreases
3. the temperature of the solution does not change
4. the temperature of the solution rises
Which of these processes is always exothermic? [et-27]
1. burning
2. evaporation
3. insulation
4. melting
Which of these processes is always exothermic? [et-28]
1. combustion
2. evaporation
3. insulation
4. melting
Which of these process is always endothermic? [et-29]
1. burning
2. condensation
3. evaporation
4. freezing
Which of these process is always endothermic? [et-30]
1. burning
2. condensation
3. freezing
4. melting
Which of these process is always endothermic? [et-31]
1. burning
2. boiling
3. condensation
4. freezing
Which of these process is always exothermic? [et-32]
1. boiling
2. condensing
3. evaporation
4. melting
Which of these process is always exothermic? [et-33]
1. boiling
2. evaporating
3. freezing
4. melting
The chemical change when a fuel burns can be described as? [et-34]
1. an endothermic reaction
2. an exothermic reaction
3. a precipitation
4. a reversible reaction
When ammonium nitrate is added to water, an endothermic reaction occurs and? [et-35]
1. heat is given out
2. the surroundings get hotter
3. the temperature falls
4. 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]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
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]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
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]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
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]
1. temperature rises by 3^oC
2. temperature rises by 5^oC
3. temperature falls by 3^oC
4. temperature falls by 5^oC
Which of the following energy changes corresponds to the activation energy required for the forward reaction to take place? [et-40]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the overall energy change for the reaction? [et-42]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the activation energy required for the forward reaction to take place? [et-43]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
Which of the following energy changes corresponds to the overall energy change for the reaction? [et-45]
1. energy change 1
2. energy change 2
3. energy change 3
4. energy change 4
When an exothermic reaction takes place, the reaction mixture gets hotter because? [et-46]
1. energy is always released in a chemical change which makes new substances
2. exothermic changes always produce gases
3. in an exothermic change the products are less stable than the reactants
4. 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]
1. energy is always released in a chemical change which makes new substances
2. exothermic changes always produce gases
3. in an exothermic change the products are more stable than the reactants
4. 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]
1. energy is always absorbed in a chemical change which makes new substances
2. endothermic changes always produce energy
3. in an endothermic change the products are more stable than the reactants
4. 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]
1. energy is always absorbed in a chemical change which makes new substances
2. endothermic changes always produce energy
3. in an endothermic change the products are less stable than the reactants
4. 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]
1. Activation energy
2. Catalyst energy
3. Kinetic energy
4. Renewable energy
Which of these involves a chemical reaction? [et-82]
1. baking bread : 2. boiling water : 3. corroding metals
1. 1 and 2
2. 1 and 3
3. 2 and 3
4. All of them
Which of the following is a chemical change? [et-83]
1. cooling a cup of tea
2. dissolving sugar in coffee
3. lighting a match
4. melting an ice-cube
Which of the following is a physical change? [et-84]
1. dissolving sugar in coffee
2. lighting a match
3. making lime from limestone
4. making polythene from gaseous oil molecules
Which of the following involves a chemical reaction? [et-85]
1. cooking a cake
2. filtering sand from water
3. fractionally distilling oil
4. melting ice
Which of the following results in a chemical reaction? [et-86]
1. adding vinegar to water
2. leaving milk to go sour
3. mixing salt with water
4. stirring sugar with tea
Which of these involves a chemical reaction? [et-87]
1. apples decaying
2. ice melting
3. magnetising iron
4. boiling water
Which of these involves a physical change and NOT a chemical reaction? [et-88]
1. apples decaying
2. frying bacon
3. iron rusting
4. boiling water
Which of these involves a physical change and NOT a chemical reaction? [et-89]
1. apples decaying
2. frying bacon
3. iron rusting
4. freezing water
Which of these involves a chemical reaction? [et-90]
1. crushing apples
2. toasting bread
3. magnetising iron
4. freezing water
Which of these results in chemical change? [et-91]
1. adding lime to vinegar
2. adding milk to tea
3. mixing salt with water
4. mixing iron and sulfur powders
Which of these results ONLY in a physical change? [et-92]
1. adding lime to vinegar
2. leaving bread to go mouldy
3. mixing salt with water
4. adding magnesium to hydrochloric acid
Which of the following temperature changes is NOT the result of a chemical change? [et-93]
1. a fall in temperature as liquid metal cools to solidify
2. a fall in temperature as a precipitate falls
3. a rise in temperature as neutralisation takes place
4. a rise in temperature when a fuel burns

time (min)	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0	5.5	6.0
Vol (cm³)	0	8	15	?	26	30	33	36	38	39	40	40	40

Edexcel GCSE 9-1 Chemistry/Science QUIZ TOPIC 7 "Rates of reaction and energy changes" (FT)

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