GCSE Combined Science (AQA)

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Tests for Gases

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Chemical analysis Identification of common gases

Tests for Gases

3:25 Tests for Gases
Spec 4.8.2.1 4.8.2.2 4.8.2.3 4.8.2.4
Previous Rf Values Next Rate Calculations using Moles
  • Tests can detect and identify gases such as hydrogen, oxygen, carbon dioxide, and chlorine.
  • Hydrogen test: Place a burning splint at the open end of a test tube; if hydrogen is present, it will burn with a pop sound.
  • Oxygen test: Insert a glowing splint into a test tube; if oxygen is present, it will relight the splint.
  • Carbon dioxide test: Use lime water; if carbon dioxide is present, the lime water turns milky or cloudy.
  • Chlorine test: Use damp litmus paper; if chlorine is present, the paper turns red and then bleaches white.
  • For exams, recall tests and observations for hydrogen, oxygen, carbon dioxide, and chlorine.

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