Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Rates of Reaction
164 practice questions
Topics covered
- Experiments to measure the rate of reaction19 practice questions
- Explaining what's happening19 practice questions
- Changing the surface area of the reactants19 practice questions
- Changing the concentration of the reactants19 practice questions
- Changing the pressure on the reaction19 practice questions
- What are catalysts?19 practice questions
- How does a catalyst work?20 practice questions
- Catalysts in industry19 practice questions
Practice questions
1–10 of 69 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State two different ways to measure the rate of the reaction between marble chips and dilute hydrochloric acid in a laboratory experiment.
Question 2
4 marks · Normal
Answer and see the solution →(a)[1 mark]Describe how the surface area of marble chips could be changed in an experiment investigating the rate of reaction between calcium carbonate and hydrochloric acid.
(b)[2 marks]Explain, using particle collision theory, why the reaction rate changes when marble chips are powdered instead of used whole.
(c)[1 mark]State one variable, other than surface area, that should be kept constant during this investigation.
Question 3
3 marks · Normal
Answer and see the solution →In an experiment, 0.60 g of carbon dioxide is collected in the first two minutes of the reaction between marble chips and hydrochloric acid.
Calculate the average rate of reaction in g/min during these two minutes. Show your working.
Question 4
3 marks · Normal
Answer and see the solution →Explain why the rate of the reaction between marble chips and hydrochloric acid is fastest at the start and slows down as the reaction continues. Refer to changes in concentration and particle collisions in your answer.
Question 5
4 marks · Normal
Answer and see the solution →Time / min Mass of CO2 lost / g 0 0.00 1 0.32 2 0.54 3 0.63 4 0.66 5 0.67 (a)[1 mark]Calculate the average rate of reaction between 0 and 2 minutes (give your answer in g/min).
(b)[1 mark]Calculate the average rate of reaction between 2 and 5 minutes (give your answer in g/min).
(c)[2 marks]State and explain the main trend in the rate of reaction as time increases.
Question 6
1 mark · Normal
Answer and check →What is a suitable method to measure the volume of carbon dioxide produced during the reaction between marble chips and hydrochloric acid?
- A.Collecting gas over water in a measuring cylinder
- B.Measuring the temperature change of the reaction
- C.Observing the colour change of the solution
- D.Recording the change in pH using a pH sensor
Question 7
2 marks · Normal
Answer and see the solution →State two safety precautions you should take when performing an experiment to measure the rate of reaction between marble chips and hydrochloric acid.
Question 8
4 marks · Normal
Answer and see the solution →(a)[2 marks]Draw a labelled diagram of the apparatus you could use to measure the loss of mass during the reaction between excess marble chips and dilute hydrochloric acid.
(b)[2 marks]Explain why cotton wool is placed in the neck of the flask during this experiment.
Question 9
2 marks · Normal
Answer and see the solution →Explain why not every collision between reactant particles in a chemical reaction leads to a reaction.
Question 10
4 marks · Normal
Answer and see the solution →A student adds excess powdered magnesium to dilute hydrochloric acid in a beaker. The mixture fizzes and gives off a gas.
(a)[1 mark]State the name of the gas produced in this reaction.
(b)[3 marks]Explain, using collision theory, why the reaction is faster at the start than near the end.