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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Formulas

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Formulas

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Paper 3Theory (Core)2 marks

Analyze the molecular structure of methane as shown in the diagram.

Diagram Description

Methane Molecule Diagram

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

  1. a

    Analyse the molecular formula of methane based on the diagram.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Formulas

Paper 3Theory (Core)1 marks

Diagram Description

Water Molecule Diagram

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

  1. a

    Identify the formula of the water molecule shown in the diagram.

    Aim for approximately 1 distinct marking point.

    [1]