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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Air quality and climate

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Air quality and climate

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Paper 4Theory (Extended)1 marks

The role of catalytic converters in reducing vehicle emissions.

Description

Catalytic Converters

Catalytic converters are devices installed in the exhaust systems of vehicles to reduce harmful emissions. They facilitate chemical reactions that convert nitrogen oxides and carbon monoxide into less harmful substances.

  1. a

    State the main pollutants that catalytic converters help to reduce.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Air quality and climate

Paper 4Theory (Extended)4 marks

Description

Chemical Reactions in Catalytic Converters

Catalytic converters facilitate the conversion of harmful gases into less harmful ones. For example, nitrogen oxides can be converted into nitrogen and oxygen, while carbon monoxide is converted into carbon dioxide.

  1. a

    Explain how nitrogen oxides are removed from exhaust gases in a catalytic converter.

    Aim for approximately 4 distinct marking points.

    [4]