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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)1 marks

Analyzing the molecular formula of a compound.

Description

Molecular Formula of Acetic Acid

The molecular formula for acetic acid is C2H4O2. This formula indicates that each molecule of acetic acid contains two carbon atoms, four hydrogen atoms, and two oxygen atoms.

  1. a

    Identify the number of hydrogen atoms in acetic acid.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Formulas

Paper 3Theory (Core)2 marks

Description

Molecular Formula Analysis

The molecular formula of a compound provides information about the types and numbers of atoms in a molecule. For example, the molecular formula C2H5OH represents ethanol, which contains two carbon atoms, six hydrogen atoms, and one oxygen atom.

  1. a

    Explain the significance of the molecular formula in understanding chemical compounds.

    Aim for approximately 2 distinct marking points.

    [2]