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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)3 marks

Balancing chemical equations is a fundamental skill in chemistry.

Description

Balancing the Reaction

Consider the unbalanced equation for the combustion of propane: C3H8 + O2 → CO2 + H2O.

  1. a

    Analyse Balance the equation for the combustion of propane.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Formulas

Paper 3Theory (Core)4 marks

Description

Chemical Reaction Balancing

Given the unbalanced equation: Fe + O2 → Fe2O3.

  1. a

    Explain Balance the equation and explain the steps taken.

    Aim for approximately 4 distinct marking points.

    [4]