Identification of Common Gases (AQA GCSE Chemistry Combined Science): Flashcards

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Test used to identify hydrogen gas

Burning splint test

Result when burning splint meets hydrogen

Squeaky pop sound

Test used to identify oxygen gas

Glowing splint test

Result when glowing splint is placed in oxygen

Splint relights/bursts into flames

Test used to identify carbon dioxide

Limewater test

Result when CO2\text{CO}_2 is bubbled through limewater

Limewater turns milky/cloudy white

Chemical name for limewater

Calcium hydroxide solution

Milky substance formed in CO2\text{CO}_2 limewater test

Calcium carbonate

Equation: Ca(OH)2+CO2→\text{Ca(OH)}_2 + \text{CO}_2 \rightarrow

CaCO3+H2O\text{CaCO}_3 + \text{H}_2\text{O}

Test used to identify chlorine gas

Damp litmus paper test

Result when damp litmus paper meets chlorine

Litmus bleaches to white

Blue litmus colour changes with chlorine

Blue to red, then white (bleached)

Why chlorine bleaches litmus paper

Chlorine is a strong bleaching agent

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