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8.2 Identification of common gases

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Question 3

A student tests three gas samples. The results are shown in the table.

Gas sampleDamp blue litmus paperDamp red litmus paperDry blue litmus paper
PTurns red, then whiteTurns whiteNo change
QTurns redNo changeNo change
RNo changeNo changeNo change
a.

Use the results to identify which sample contains chlorine. Give one observation that supports your answer.

[2]
b.

Explain why the dry blue litmus paper does not change when it is used to test for chlorine.

[1]
c.

A student plans to test an unknown gas sample on an open bench and lean close to the test tube to inspect the litmus paper. Evaluate this plan and suggest one change to reduce the risk.

[2]
Markscheme

8.2 Identification of common gases Questions

  1. GCSE
  2. /Chemistry
  3. /8.2 Identification of common gases

89 exam-style questions on AQA GCSE Chemistry 8.2 Identification of common gases, covering 8.2.1 Test for hydrogen, 8.2.2 Test for oxygen, 8.2.3 Test for carbon dioxide, and 8.2.4 Test for chlorine. Each one has a worked solution and a mark scheme showing where the marks go.

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