Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Physical Chemistry
442 practice questions
Topics covered
Practice questions
121–130 of 442
Question 121
2 marks · Easy
Answer and see the solution →Explain how increasing the temperature affects the rate of a reaction between a solid and a solution. Give two reasons for your answer.
Question 122
3 marks · Easy
Answer and see the solution →The table below shows part of an experiment where the mass of carbon dioxide lost was measured every minute as marble chips reacted with dilute hydrochloric acid.
Time / min Mass of CO2 lost / g 0 0.00 1 0.38 2 0.59 3 0.68 4 0.71 (a)[1 mark]Calculate the average rate of reaction between 1 and 2 minutes, giving your answer in g/min.
(b)[1 mark]At which time interval was the reaction fastest? Give your reasoning.
(c)[1 mark]Suggest one practical reason why the mass measured might not decrease exactly as expected.
Question 123
1 mark · Easy
Answer and see the solution →State the name of the solid reactant used in the reaction with hydrochloric acid to produce carbon dioxide gas.
Question 124
3 marks · Easy
Answer and see the solution →A student performs an experiment to investigate how a catalyst affects the rate of decomposition of hydrogen peroxide solution. The student uses different solids as possible catalysts.
(a)[1 mark]State the name of the gas collected during the decomposition of hydrogen peroxide.
(b)[1 mark]Give one method by which the rate of gas production can be measured in this experiment.
(c)[1 mark]Suggest why different solids may produce different rates of reaction.
Question 125
2 marks · Easy
Answer and see the solution →A reaction produces 80 cm³ of carbon dioxide in 4 minutes. Calculate the average rate of reaction in cm³/min.
Question 126
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 127
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 128
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 129
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 130
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.