IGCSE Combined Science 0653 · Chemistry · 20

0653.C3.1.01 — State the formulas of the elements and compounds named in the subject content: past paper questions

6 real questionsasked in 2 of the last 10 exam series2022–2024usually: State, Identify, Which, What, Deduce

Real questions on 0653.c3.1.01 — state the formulas of the elements and compounds named in the subject content

The newest 6 of 6 written questions. Open one to see it on the real paper.

0653/33 · October/November 2024 · Q8b[1]
State the formula of sulfuric acid.
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0653/62 · October/November 2023 · Q2c[1]
When the student tests the gas with a lighted splint, there is a squeaky pop. Identify the gas produced in the reaction.
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0653/11 · October/November 2022 · Q15[1]
Which values of w, x, y and z balance this equation?
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0653/12 · October/November 2022 · Q20[1]
What is substance J?
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0653/43 · October/November 2022 · Q5c(i)[1]
The reaction produces iron( II ) chloride. State the formula of iron( II ) chloride.
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0653/43 · May/June 2022 · Q8b[1]
The reaction also produces calcium chloride. Calcium chloride contains calcium ions, Ca 2+ , and chloride ions, Cl – . Deduce the formula for calcium chloride.
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What examiners said

Many candidates were able to correctly link the squeaky pop with a lighted splint to hydrogen.
— Examiner report, October/November 2023, 0653/62 Q2(c) (Cambridge)

Some candidates were able to state the correct formula for iron(II)oxide. The most common incorrect answer was Fe2Cl. A few candidates incorrectly thought they needed to provide a balanced symbol equation for the reaction.
— Examiner report, October/November 2022, 0653/43 Q5(c)(i) (Cambridge)

This was answered correctly by many candidates. Candidates needed to present the formula of calcium chloride perfectly in order to gain the mark. Letters in the symbols must be clearly upper and lower case and the figure 2 must be shown as a subscript.
— Examiner report, May/June 2022, 0653/43 Q8(b) (Cambridge)

Practise this topic

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Practise 0653.c3.1.01 — state the formulas of the elements and compounds named in the subject content

In the syllabus

20 0653.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 equations, including state symbols
Construct symbol equations with state symbols, including ionic equations

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