A student is given one test tube of an unknown gas. The gas is hydrogen, oxygen, carbon dioxide or chlorine. The student cannot collect any more of the gas.
The student plans to use a burning splint as the first test. Explain why this is not a good plan.
The student puts damp litmus paper into the test tube. The litmus paper does not change colour. Give the conclusion the student can make from this result.
The student then shakes the gas with limewater. The limewater turns milky. Name the gas.
40 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.