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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Exothermic and endothermic reactions

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Exothermic and endothermic reactions

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Paper 4Theory (Extended)1 marks

Thermodynamics in chemical reactions

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Enthalpy Changes in Reactions

Consider the following reactions: 1) Combustion of methane, 2) Dissolving ammonium chloride in water. Identify the type of enthalpy change for each reaction.

  1. a

    State the type of enthalpy change for the combustion of methane.

    Aim for approximately 1 distinct marking point.

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Paper 4 structured question: Exothermic and endothermic reactions

Paper 4Theory (Extended)1 marks

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Enthalpy Changes

When ammonium nitrate dissolves in water, the temperature of the solution decreases. This indicates that the reaction absorbs heat from the surroundings.

  1. a

    State the type of enthalpy change for the dissolution of ammonium nitrate.

    Aim for approximately 1 distinct marking point.

    [1]