Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Physical Chemistry
442 practice questions
Topics covered
Practice questions
131–140 of 442
Question 131
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 132
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 133
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 134
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 135
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 136
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 137
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.
Question 138
3 marks · Easy
Answer and see the solution →The reaction between powdered iron and dilute sulfuric acid produces hydrogen gas.
(a)[1 mark]State what particles must do for a reaction to take place according to collision theory.
(b)[1 mark]Name the term for the minimum amount of energy particles need to react when they collide.
(c)[1 mark]Explain why the reaction slows down as the acid is gradually used up.
Question 139
2 marks · Easy
Answer and see the solution →Explain, using collision theory, why a reaction between magnesium ribbon and excess hydrochloric acid is faster at the start than at the end.
Question 140
3 marks · Easy
Answer and see the solution →A student observes the reaction between excess sodium carbonate and dilute hydrochloric acid. The table shows the concentration of acid over time.
Concentration of acid during reaction Time (min) Acid concentration (mol/dm³) 0 1.00 1 0.85 2 0.70 3 0.60 4 0.59 5 0.59 (a)[1 mark]Between which two times was the reaction fastest? Explain your answer.
(b)[1 mark]State why the reaction gradually slows down as shown in the table.
(c)[1 mark]According to collision theory, what needs to happen for acid particles to react with sodium carbonate?