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Identifying Gases for Edexcel A-level Chemistry







This page covers the following topics:
1. Test for hydrogen
2. Test for carbon dioxide
3. Test for oxygen
4. Test for chlorine
5. Gas tests
We can test for hydrogen by placing a lighted split in a test tube containing the gas.
The test for carbon dioxide involves bubbling the gas through limewater.
We can use a glowing splint to test for oxygen in a test tube.
We can use damp litmus paper to test for chlorine.
Gases can be identified in the lab by simple tests.
1
If oxygen is present in the test tube what will we see?
The glowing splint will relight
2
What property of chlorine gas is it that allows it to act as a bleach?
It is an acidic gas.
3
You suspect a gas you are testing to be toxic, what precaution should you take when testing it in the lab?
Carry out the tests in a fume cupboard.
4
What type of paper is used in the test for chlorine?
Damp litmus paper.
5
You are testing a gas you know to be either hydrogen or chlorine. Which test would you use? Why?
The test for hydrogen - it is quicker and easier to carry out.
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