plumiFormulae: CAIE IGCSE Chemistry questions
Every CAIE IGCSE Chemistry exam question on 3.1 Formulae, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Calculations
Q2(b)
The whole paper ↗![June 2024 Paper 3, question 2(b): Some medicines contain a compound made of Mg2+ ions and OH– ions. Name the compound made of Mg2+ ions and OH– ions. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062031-jun24-02-b-qp.webp)
Q2(g)
The whole paper ↗
Q5(b)(i)
The whole paper ↗![June 2024 Paper 3, question 5(b)(i): Complete the symbol equation for the incomplete combustion of carbon to produce carbon monoxide. .....C + O2 → .....CO [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062031-jun24-05-bi-qp.webp)
Q5(c)
The whole paper ↗![June 2024 Paper 3, question 5(c): Fig. 5.1 shows the displayed formula of chromium carbonyl. O O C O C C Cr C C O C O O Fig. 5.1 Deduce the molecular formula of chromium carbonyl. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062031-jun24-05-c-qp.webp)
Q6(a)
The whole paper ↗![June 2024 Paper 3, question 6(a): Complete the equation by adding the missing state symbol. S(.....) + O2(g) → SO2(g) [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062031-jun24-06-a-qp.webp)
Q3(a)
The whole paper ↗![June 2024 Paper 4, question 3(a): Sodium reacts with fluorine to form sodium fluoride. Write a symbol equation for this reaction. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062041-jun24-03-a-qp.webp)
Q5(a)(iii)
The whole paper ↗![June 2024 Paper 4, question 5(a)(iii): Write an ionic equation for the precipitation reaction which produces lead(II) bromide. Include state symbols. [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062041-jun24-05-aiii-qp.webp)
Q5(c)
The whole paper ↗![June 2024 Paper 4, question 5(c): Complete the equation for the thermal decomposition of hydrated cobalt(II) nitrate. 2Co(NO3)2•4H2O → ....CoO + ....NO2 + O2 + ....H2O [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062041-jun24-05-c-qp.webp)
Q6(d)(ii)
The whole paper ↗
Q2(c)(ii)
The whole paper ↗![Specimen Paper 3, question 2(c)(ii): Deduce the molecular formula of lactic acid. [1] [Total: 9]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062003-spec-02-cii-qp.webp)
Q3(e)
The whole paper ↗![Specimen Paper 3, question 3(e): When cobalt(II) oxide, CoO, is heated in air an oxide with the formula Co3O4 is formed. Balance the equation for this reaction. … CoO + O2 → 2Co3O4 [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062003-spec-03-e-qp.webp)
Q8(a)(i)
The whole paper ↗![Specimen Paper 3, question 8(a)(i): Complete the equation for the burning of hydrogen. H2(g) + O2(g) → H2O(l) [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062003-spec-08-ai-qp.webp)
Q8(a)(ii)
The whole paper ↗![Specimen Paper 3, question 8(a)(ii): State the meaning of (g) and (l). (g) (l) [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062003-spec-08-aii-qp.webp)
Q1(c)
The whole paper ↗![Specimen Paper 4, question 1(c): Element X is a Group III metal. It burns in air to form an oxide X2O3. Write a symbol equation for this reaction. [2] [Total: 10]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062004-spec-01-c-qp.webp)
Q2(c)(iv)
The whole paper ↗![Specimen Paper 4, question 2(c)(iv): Write a symbol equation for the reaction of calcium with cold water. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062004-spec-02-civ-qp.webp)
Q2(e)
The whole paper ↗![Specimen Paper 4, question 2(e): Aqueous silver nitrate is added to aqueous magnesium chloride. A white precipitate forms. Write an ionic equation for this reaction. Include state symbols. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062004-spec-02-e-qp.webp)
All 19 questions on Formulae, as a list
- June 2024, Paper 1, Q8 (1 mark): Iron(III) oxide is reduced by carbon monoxide to produce iron and carbon dioxide. What is the balanced equation for this reaction? A Fe2O3 + 2CO → 2Fe + 2CO2 B
- June 2024, Paper 2, Q11 (1 mark): What is the empirical formula of ethanoic acid? A CHO B CH2O C C2H2O D C2H4O2
- June 2024, Paper 3, Q2(b) (1 mark): Some medicines contain a compound made of Mg2+ ions and OH– ions. Name the compound made of Mg2+ ions and OH– ions. [1]
- June 2024, Paper 3, Q2(g) (2 marks): Sodium reacts with water to produce sodium hydroxide and a gas which pops with a lighted splint. Complete the symbol equation for this reaction. .....Na + 2H2
- June 2024, Paper 3, Q5(b)(i) (2 marks): Complete the symbol equation for the incomplete combustion of carbon to produce carbon monoxide. .....C + O2 → .....CO [2]
- June 2024, Paper 3, Q5(c) (1 mark): Fig. 5.1 shows the displayed formula of chromium carbonyl. O O C O C C Cr C C O C O O Fig. 5.1 Deduce the molecular formula of chromium carbonyl. [1]
- June 2024, Paper 3, Q6(a) (1 mark): Complete the equation by adding the missing state symbol. S(.....) + O2(g) → SO2(g) [1]
- June 2024, Paper 4, Q3(a) (2 marks): Sodium reacts with fluorine to form sodium fluoride. Write a symbol equation for this reaction. [2]
- June 2024, Paper 4, Q5(a)(iii) (3 marks): Write an ionic equation for the precipitation reaction which produces lead(II) bromide. Include state symbols. [3]
- June 2024, Paper 4, Q5(c) (2 marks): Complete the equation for the thermal decomposition of hydrated cobalt(II) nitrate. 2Co(NO3)2•4H2O → ....CoO + ....NO2 + O2 + ....H2O [2]
- June 2024, Paper 4, Q6(d)(ii) (1 mark): When zinc oxide neutralises aqueous sodium hydroxide, sodium zincate is formed. The formula of the zincate ion is ZnO2 2–. Deduce the formula of sodium zinca
- Specimen, Paper 2, Q6 (1 mark): Aqueous iron(III) sulfate and aqueous sodium hydroxide react to give a precipitate of iron(III) hydroxide and a solution of sodium sulfate. What is the balanced
- Specimen, Paper 3, Q2(c)(ii) (1 mark): Deduce the molecular formula of lactic acid. [1] [Total: 9]
- Specimen, Paper 3, Q3(e) (1 mark): When cobalt(II) oxide, CoO, is heated in air an oxide with the formula Co3O4 is formed. Balance the equation for this reaction. … CoO + O2 → 2Co3O4 [1]
- Specimen, Paper 3, Q8(a)(i) (1 mark): Complete the equation for the burning of hydrogen. H2(g) + O2(g) → H2O(l) [1]
- Specimen, Paper 3, Q8(a)(ii) (2 marks): State the meaning of (g) and (l). (g) (l) [2]
- Specimen, Paper 4, Q1(c) (2 marks): Element X is a Group III metal. It burns in air to form an oxide X2O3. Write a symbol equation for this reaction. [2] [Total: 10]
- Specimen, Paper 4, Q2(c)(iv) (2 marks): Write a symbol equation for the reaction of calcium with cold water. [2]
- Specimen, Paper 4, Q2(e) (2 marks): Aqueous silver nitrate is added to aqueous magnesium chloride. A white precipitate forms. Write an ionic equation for this reaction. Include state symbols. [2]
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