Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Experiments to measure the rate of reaction
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
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 2
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 3
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.