Physical and chemical changes: past paper questions
Real questions on physical and chemical changes
The newest 20 of 70 written questions. Open one to see it on the real paper.
- 5070/21 · October/November 2025 · Q4c(ii)[1]
Describe the observations made during the reaction.
See it on the paper → - 5070/21 · October/November 2025 · Q6d[2]
Suggest the observations when ethyne gas is bubbled into aqueous bromine.
See it on the paper → - 5070/21 · October/November 2025 · Q7a(i)[1]
Name this process.
See it on the paper → - 5070/21 · October/November 2025 · Q7a(ii)[2]
Describe the conditions used in this process.
See it on the paper → - 5070/21 · October/November 2025 · Q7d(i)[1]
Explain why this is an example of an addition reaction.
See it on the paper → - 5070/21 · October/November 2025 · Q7d(ii)[1]
Draw the displayed formula of the product of this reaction.
See it on the paper → - 5070/42 · May/June 2025 · Q3b(ii)[1]
Explain how the student knows when the reaction has finished.
See it on the paper → - 5070/21 · October/November 2024 · Q5a[1]
Complete the equation by adding state symbols for the products. CuCO 3 (s) + 2HCl (aq) CuCl 2 ( ) + H 2 O( ) + CO 2 ( )
See it on the paper → - 5070/21 · October/November 2024 · Q5d(i)[2]
Describe the observations made when: • • a few drops of aqueous ammonia are added to an aqueous solution containing copper( II ) ions excess aqueous ammonia is added to an aqueous solution containing copper( II ) ions.
See it on the paper → - 5070/21 · October/November 2024 · Q7a(iii)[2]
Propanoic acid reacts with magnesium. Name the two products of this reaction.
See it on the paper → - 5070/21 · May/June 2024 · Q1a[1]
is a catalyst in the Haber process
See it on the paper → - 5070/21 · May/June 2024 · Q1c[1]
changes from a blue solid to a white solid when heated
See it on the paper → - 5070/22 · May/June 2024 · Q1c[1]
changes from a white solid to a blue solid when water is added to it
See it on the paper → - 5070/22 · May/June 2024 · Q2c(i)[2]
Explain, using ideas about bond breaking and bond making, why this reaction is exothermic.
See it on the paper → - 5070/42 · October/November 2023 · Q2f[2]
Describe and explain what happens to the gradient of the straight line for the first four points on the graph if a metal cup is used instead of a plastic cup.
See it on the paper → - 5070/22 · May/June 2023 · Q1c[1]
reacts with warm dilute hydrochloric acid to give a blue coloured solution
See it on the paper → - 5070/22 · May/June 2023 · Q2b(iii)[1]
Describe what is observed during the displacement reaction.
See it on the paper → - 5070/42 · May/June 2023 · Q2h[2]
The student rinses the burette with 0.500 mol / dm 3 hydrochloric acid immediately before it is filled. Explain why the student should not rinse the burette with distilled water immediately before it is filled with 0.500 mol / dm 3 hydrochloric acid.
See it on the paper → - 5070/42 · May/June 2023 · Q2i[1]
Suggest why universal indicator is not suitable for use in these titrations.
See it on the paper → - 5070/42 · May/June 2023 · Q3b(ii)[1]
The observations for test 1 are incomplete. State one other observation that the student makes for test 1.
See it on the paper →
What examiners said
Most candidates correctly recognised that there would be more energy transferred to the surroundings as metal is a good conductor of heat. The candidates should have then realised that this would make the gradient less steep. Most candidates incorrectly stated that the gradient would be steeper.
— Examiner report, October/November 2023, 5070/42 Q2(f) (Cambridge)
Many candidates appreciated CuO reacts with dilute hydrochloric acid to give a blue solution. Other common incorrect answers were CaO and ZnO.
— Examiner report, May/June 2023, 5070/22 Q1(c) (Cambridge)
Many candidates did not give an observation but gave an answer that explained why a displacement reaction happens. Even those candidates that gave observations often gave incorrect observations such as red, black or purple solutions. Only a small proportion of candidates mentioned the formation of a brown solution. Some candidates thought that iodine was formed as a gas.
— Examiner report, May/June 2023, 5070/22 Q2(b)(iii) (Cambridge)
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