Tests for Gases

This lesson covers:

  1. How to test for the gases chlorine, oxygen, hydrogen, and carbon dioxide

How do you test for chlorine gas?

Expose it to a lit splint

Bubble it though limewater

Expose it to damp blue litmus paper

Expose it to a glowing splint

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What happens when damp blue litmus paper is exposed to chlorine gas?

The damp litmus paper lights on fire

The damp litmus paper turns green

The damp litmus paper turns red, then bleaches white

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What safety precautions are required for testing chlorine gas?

(Select all that apply)

Do not have any paper nearby

Do the experiment in a fume cupboard

Wear a gas mask

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Diagram showing oxygen molecules represented as pairs of atoms bonded together.

How do you test for oxygen gas?

Bubble it though limewater

Expose it to damp blue litmus paper

Expose it to a lit splint

Expose it to a glowing splint

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Glowing splint exposed to oxygen gas test.

What happens when a glowing splint is exposed to oxygen gas?

The flame will be extinguished 

It will give a squeaky pop sound

The glowing splint will relight 

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How do you test for hydrogen gas?

Expose it to a glowing splint

Expose it to damp blue litmus paper

Expose it to a lit splint

Bubble it though limewater

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What happens when hydrogen gas is exposed to a lit splint?

The flame fizzles out 

There is a squeaky pop sound

The flame will burn green

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Illustration of carbon dioxide molecules showing the arrangement of carbon and oxygen atoms.

How do you test for carbon dioxide gas?

Expose it to damp blue litmus paper

Bubble it through limewater

Expose it to a glowing splint

Expose it to a burning splint

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What happens when you bubble carbon dioxide gas through limewater?

The limewater turns cloudy

The limewater turns blue

Solid crystals form 

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