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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

Chemical formulas are essential in identifying substances in chemistry.

Description

Chemical Formulas

Chemical formulas represent the composition of compounds and elements. They indicate the types and numbers of atoms present in a molecule.

  1. a

    Identify the chemical formula for sodium chloride.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Formulas

Paper 3Theory (Core)2 marks

Description

Chemical Formulas

Chemical formulas provide information about the elements in a compound and their ratios. They are used to predict the behavior of substances in chemical reactions.

  1. a

    Explain the significance of chemical formulas in chemistry.

    Aim for approximately 2 distinct marking points.

    [2]