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Cambridge IGCSE Chemistry practice

Paper 3 structured question: Reversible reactions and equilibrium

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Reversible reactions and equilibrium

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Paper 3Theory (Core)1 marks

Reversible reactions are influenced by changes in conditions.

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Effects of Temperature and Water on Copper(II) Sulfate

Copper(II) sulfate can exist in a hydrated form (CuSO4·5H2O) and an anhydrous form (CuSO4). Heating the hydrated form leads to dehydration, while adding water to the anhydrous form leads to hydration.

  1. a

    State the effect of heating on hydrated copper(II) sulfate.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Reversible reactions and equilibrium

Paper 3Theory (Core)3 marks

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Hydration of Cobalt(II) Chloride

Cobalt(II) chloride can exist in an anhydrous form and a hydrated form. The anhydrous form is blue, while the hydrated form is pink. Adding water to the anhydrous form results in a color change.

  1. a

    Describe the process that occurs when water is added to anhydrous cobalt(II) chloride.

    Aim for approximately 3 distinct marking points.

    [3]