Testing Gases — GCSE Chemistry Revision
Revise Testing Gases for GCSE Chemistry. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Tests for Positive IonsWhat is Testing Gases?
Chemists use specific chemical tests to identify common gases. These tests are based on the unique chemical properties of each gas, often resulting in a distinct observation like a colour change or the extinguishing of a flame.
Board notes: The tests for hydrogen, oxygen, carbon dioxide, and chlorine are required knowledge for all exam boards. You must know the reagent used and the positive result for each test.
Step-by-step explanationWorked example
To test for carbon dioxide, bubble the gas through a test tube containing limewater. If carbon dioxide is present, the limewater will turn from a colourless solution to a milky or cloudy white precipitate of calcium carbonate.
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Common mistakes
- 1Confusing the tests for hydrogen and oxygen. Remember: hydrogen gives a 'squeaky pop' with a lit splint; oxygen relights a glowing splint.
- 2Performing the test for carbon dioxide incorrectly. You must bubble the gas through limewater (calcium hydroxide solution); just shaking it with limewater is not as effective.
- 3Forgetting the result for the chlorine test. Chlorine bleaches damp litmus paper, turning it white.
Testing Gases exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Testing Gases
Core concept
Chemists use specific chemical tests to identify common gases. These tests are based on the unique chemical properties of each gas, often resulting in a distinct observation like a colour change or th…
Frequently asked questions
What is the test for hydrogen?
Place a lit splint into a test tube of the gas. If hydrogen is present, you will hear a 'squeaky pop' sound as the hydrogen burns rapidly.
What is the test for oxygen?
Place a glowing splint (a splint that has been lit and then blown out) into a test tube of the gas. If oxygen is present, the splint will relight.