Cambridge IGCSE Combined Science practice

Paper 3 structured question: Formulas

Try the question first, then check the answer and practise the same topic again.

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Paper

Marks

Topic

Formulas

Exam-style question

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Paper 3Theory (Core)1 marks

Given a diagram of a water molecule, identify the formula.

Diagram Description

The diagram shows two hydrogen atoms bonded to one oxygen atom.

a
Identify the formula of the water molecule shown in the diagram.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 3Theory (Core)2 marks

Diagram Description

The diagram shows one carbon atom bonded to four hydrogen atoms.

a
Analyse the molecular formula of methane based on the diagram.
Your answer
Aim for approximately 2 distinct marking points.
[2]