Identifying Gases for SQA National 5 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.
If oxygen is present in the test tube what will we see?
The glowing splint will relight
What property of chlorine gas is it that allows it to act as a bleach?
It is an acidic gas.
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.
What type of paper is used in the test for chlorine?
Damp litmus paper.
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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