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Cambridge IGCSE Chemistry practice

Paper 4 structured question: Electrolysis

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Electrolysis

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Paper 4Theory (Extended)4 marks

Electrolysis of water is conducted to produce hydrogen and oxygen gases.

Description

Electrolysis of Water

In the electrolysis of water, hydrogen ions move towards the cathode and oxygen ions move towards the anode. Electrons flow from the anode to the cathode.

  1. a

    Describe the charge transfer process during the electrolysis of water.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 4 structured question: Electrolysis

Paper 4Theory (Extended)1 marks

Description

Electrolysis Process

During the electrolysis of a salt solution, ions migrate towards the electrodes. Cations move towards the cathode and anions move towards the anode. Electrons flow through the external circuit from the anode to the cathode.

  1. a

    State the movement of cations during electrolysis.

    Aim for approximately 1 distinct marking point.

    [1]