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

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What is the test used to identify hydrogen gas?

Burning splint test

What is heard when a burning splint is held near hydrogen gas?

A squeaky pop sound

Why does hydrogen make a pop sound with a burning splint?

It's highly flammable

What state must the splint be in when testing for oxygen gas?

Glowing red-hot

What happens to a glowing splint in oxygen gas?

It relights into flames

Which substance is used to test for carbon dioxide?

Limewater

What happens to limewater when carbon dioxide is bubbled through it?

Turns milky white

What is the equation for the limewater test? Ca(OH)2+CO2\text{Ca(OH)}_2 + \text{CO}_2 \rightarrow ?

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

What is used to test for chlorine gas?

Damp litmus paper

What happens to blue litmus paper in chlorine gas?

Turns red then white

Why does chlorine bleach litmus paper?

It's a strong bleaching agent

A gas turns limewater milky. Which gas is present?

Carbon dioxide

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