Physical and chemical changes: past paper questions
Real questions on physical and chemical changes
The newest 20 of 332 written questions. Open one to see it on the real paper.
- 0620/31 · May/June 2026 · Q2b(i)[1]
Aqueous chlorine reacts with aqueous sodium iodide to produce aqueous iodine and aqueous sodium chloride. State the name of this type of reaction.
See it on the paper → - 0620/31 · May/June 2026 · Q2b(ii)[2]
Complete the symbol equation for this reaction. Cl 2 + NaI + 2NaCl
See it on the paper → - 0620/31 · May/June 2026 · Q4c(i)[2]
Name the two products of the complete combustion of pentane. and
See it on the paper → - 0620/31 · May/June 2026 · Q5d[1]
A sealed gas syringe contains 60 cm 3 of oxygen gas. State how the pressure inside the syringe changes when the plunger of the syringe is pushed in and the temperature remains constant.
See it on the paper → - 0620/32 · May/June 2026 · Q2b(i)[2]
Complete the symbol equation for this reaction.
See it on the paper → - 0620/32 · May/June 2026 · Q2b(ii)[1]
Bubbles of hydrogen gas are observed. State the test for hydrogen gas. test positive result
See it on the paper → - 0620/32 · May/June 2026 · Q5a[2]
State two general properties of a liquid.
See it on the paper → - 0620/32 · May/June 2026 · Q7f[2]
State the colour change when water is added to anhydrous cobalt( II ) chloride. from to
See it on the paper → - 0620/33 · May/June 2026 · Q3a(i)[1]
State the meaning of the symbol (aq) in this equation.
See it on the paper → - 0620/33 · May/June 2026 · Q3b(i)[1]
State why the mass of the reaction mixture decreases.
See it on the paper → - 0620/33 · May/June 2026 · Q7e[2]
State the colour change when water is added to anhydrous copper( II ) sulfate. from to
See it on the paper → - 0620/41 · May/June 2026 · Q1e[1]
a reaction that occurs in the Haber process
See it on the paper → - 0620/41 · May/June 2026 · Q6a(iv)[2]
When aqueous barium chloride is added to aqueous zinc sulfate, a precipitate of barium sulfate, BaSO 4 , is produced. Write an ionic equation for this precipitation reaction. Include state symbols.
See it on the paper → - 0620/41 · May/June 2026 · Q6a(v)[1]
Give the colour of the precipitate that forms in 6(a)(iv).
See it on the paper → - 0620/42 · May/June 2026 · Q2a(ii)[1]
Name the weak attractions that are overcome when bromine boils.
See it on the paper → - 0620/42 · May/June 2026 · Q3a[1]
Complete the equation for this reaction. ZnCO 3 + H 2 SO 4 ZnSO 4 + +
See it on the paper → - 0620/42 · May/June 2026 · Q3b[1]
Name one other zinc compound that reacts with dilute sulfuric acid to produce zinc sulfate.
See it on the paper → - 0620/42 · May/June 2026 · Q3c[1]
The reaction is complete when no more zinc carbonate dissolves and a white solid of excess zinc carbonate is seen in the reaction mixture. State one other observation which shows the reaction is complete.
See it on the paper → - 0620/42 · May/June 2026 · Q5a(ii)[2]
Write the symbol equation for the reaction in the Haber process. (ii)
See it on the paper → - 0620/42 · May/June 2026 · Q5a(iii)[1]
State the typical pressure, in kPa, used in the Haber process. kPa
See it on the paper →
What examiners said
Comprehensive responses • Many candidates could write the correct word equation from the information given. Limited responses • Some candidates wrote the formula equation instead of the word equation.
— Examiner report, February/March 2026, 0620/32 Q5(c)(i) (Cambridge)
Comprehensive responses • Very few candidates knew the correct chemical tests for the given ions. Limited responses • Some candidates knew that a flame test was needed to test for potassium ions. They got confused with the correct colour of the flame and used colours of other cations instead. • A few candidates knew the test for iodide ions and again got confused with the correct colour of the si...
— Examiner report, February/March 2026, 0620/32 Q8(a) (Cambridge)
Comprehensive responses • Some candidates did identify the correct water soluble compound from the given list. Limited responses • Some candidates confused the solubility rules and would benefit from applying these rules to different examples.
— Examiner report, February/March 2026, 0620/32 Q8(b) (Cambridge)
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