IGCSE Co-ordinated Sciences (Double Award) 0654 · Chemistry · 28

0654.C3.1.01 — State the formulas of the elements and compounds named in the subject content: past paper questions

7 real questionsasked in 2 of the last 10 exam series2021–2025usually: State, What, Which

Real questions on 0654.c3.1.01 — state the formulas of the elements and compounds named in the subject content

The newest 7 of 7 written questions. Open one to see it on the real paper.

0654/32 · October/November 2025 · Q5a(i)[1]
State the formula for a monatomic gas. (i)
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0654/32 · October/November 2025 · Q5a(ii)[1]
State the formula for a toxic gas.
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0654/32 · October/November 2025 · Q5a(iii)[1]
State the formula for the gas that makes up 78% of clean dry air.
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0654/32 · October/November 2025 · Q5a(iv)[1]
State the formula for an element.
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0654/11 · May/June 2024 · Q17[1]
What is the formula of hydrogen peroxide?
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0654/21 · May/June 2021 · Q17[1]
Which formula is correct?
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0654/21 · May/June 2021 · Q25[1]
What is the chemical name for lime?
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What examiners said

Candidates chose the incorrect options A and D more often than the correct option, C. Candidates are expected to know that lime, calcium oxide, is made by the thermal decomposition of limestone, calcium carbonate. They should also understand that when basic oxides dissolve in water they form alkaline hydroxides, such as calcium hydroxide. They are expected to know that calcium sulfate is the produ...
— Examiner report, May/June 2021, 0654/21 Q25 (Cambridge)

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In the syllabus

28 0654.C3.1.01 — State the formulas of the elements and compounds named in the subject content

State the formulas of the elements and compounds named in the subject content
Define the molecular formula of a compound as the number and type of atoms in one molecule
Deduce the formula of a simple molecular 6 Deduce the formula of an ionic compound compound from the relative numbers of from the relative numbers of the ions present atoms present in a model or a diagrammatic in a model or a diagrammatic representation representation or from the charges on the ions
Construct word equations to show how reactants form products
Balance and interpret simple symbol 7 Construct symbol equations with state equations, including state symbols symbols, including ionic equations
Deduce the symbol equation with state symbols for a chemical reaction, given relevant information

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