Identifying gases (Edexcel GCSE Chemistry Combined Science): Flashcards

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Identifying gases
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Test for oxygen gas

Glowing splint - it relights

Positive result of oxygen test

Glowing splint relights

Test for hydrogen gas

Lighted splint - squeaky pop sound

Positive result of hydrogen test

Squeaky pop sound

Test for carbon dioxide

Bubble through limewater

What is limewater

Solution of calcium hydroxide

Positive result for CO2CO_2 test

Limewater turns milky/cloudy white

What forms when CO2CO_2 reacts with limewater

Calcium carbonate

Test for chlorine gas

Damp litmus paper

Properties of chlorine gas

Acidic gas, acts as bleach

Blue litmus paper result with chlorine

Turns red then white (bleached)

Red litmus paper result with chlorine

Bleached white directly

Positive result for chlorine test

Bleaching of litmus paper

What oxygen does

Supports combustion

What hydrogen does in air

Ignites

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