Gas Tests

Topic 8 - Chemical Analysis
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Chlorine Gas Test

    • Insert damp litmus paper into the conical flask. (1 mark)

    • It bleaches white if chlorine gas is present (1 mark)

  • Chlorine gas is toxic. (1 mark)

Chlorine is shown as toxic using the skull and bones symbol.

Oxygen Test

    • Light up a splint & blow it out

    • Insert the glowing splint into the test tube (1 mark)

    • If oxygen is present, it relights. (1 mark)

Oxygen test using a glowing splint which, when exposed to oxygen, relights (that's the observation for this gas test).

Hydrogen Test

    • Insert a lighted splint into the tip of the test tube. (1 mark)

    • If hydrogen is present, it makes a squeaky pop! (1 mark)

Hydrogen test using a lighted splint which, when exposed to hydrogen in a test tube, makes a squeaky pop (that's the observation of this gas test).

Carbon Dioxide Test

    • Pass the gas through limewater (1 mark)

    • If the gas is carbon dioxide, it turns milky (1 mark)

Carbon dioxide test showing limewater in a test tube turning milky when exposed to carbon dioxide gas through a small pipe (that's the observation of this gas test).
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