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
11–20 of 164
Question 11
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 12
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 13
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 14
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 15
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 16
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 17
2 marks · Hard
Answer and see the solution →Describe one change you could make to the experiment measuring the rate of reaction between marble chips and hydrochloric acid that would allow the reaction to proceed more slowly. Explain your reasoning.
Question 18
5 marks · Hard
Answer and see the solution →A student performs an experiment to investigate the effect of temperature on the rate of reaction between marble chips and dilute hydrochloric acid. The reaction produces carbon dioxide gas, which is measured using a gas syringe. The student uses identical masses of marble chips and the same volume and concentration of acid at two different temperatures. The following data is recorded:
(a)Volume of CO₂ collected at 2 temperatures Time / min Volume of CO₂ at 20°C / cm³ Volume of CO₂ at 40°C / cm³ 0 0 0 1 18 40 2 27 60 3 31 62 4 33 62 (i)[2 marks]Calculate the average rate of reaction at 20°C in the first 2 minutes. Show your working.
(ii)[3 marks]Compare the rates of reaction at the two temperatures using the data. Give one reason, based on particle collisions, why the temperature affects the rate of reaction.
Question 19
2 marks · Hard
Answer and see the solution →Explain why a reaction mixture containing marble chips and dilute hydrochloric acid will still have some marble chips left at the end of the experiment.
Question 20
1 mark · Easy
Answer and see the solution →State the minimum condition that must be met for a chemical reaction to occur between two particles, according to collision theory.