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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Identification of ions and gases

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Identification of ions and gases

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Paper 3Theory (Core)3 marks

Flame tests are commonly used in chemistry to identify metal ions.

Description

Flame Test Results

When a sample containing lithium, sodium, potassium, and copper(II) ions is subjected to a flame test, the following colors are observed: lithium - crimson red, sodium - bright yellow, potassium - lilac, copper(II) - blue-green.

  1. a

    Explain the procedure for conducting a flame test and how to interpret the results.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Identification of ions and gases

Paper 3Theory (Core)2 marks

Description

Flame Test Colors

The flame test is used to identify metal ions based on the color of the flame they produce. For example, lithium produces a crimson red flame, sodium produces a bright yellow flame, potassium produces a lilac flame, and copper(II) produces a blue-green flame.

  1. a

    Describe the flame test procedure and the expected results for lithium, sodium, potassium, and copper(II) ions.

    Aim for approximately 2 distinct marking points.

    [2]