GCSE Chemistry – Testing for Gases – Hydrogen/Chlorine/Oxygen/CO2 (2026/27 exams)

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*** WHAT’S COVERED ***
1. Test for Chlorine Gas
* Using damp blue litmus paper to test for chlorine.
* The positive result is the litmus paper being bleached and turning white.
2. Test for Oxygen Gas
* Using a glowing splint to test for oxygen.
* The positive result is the glowing splint relighting.
3. Test for Hydrogen Gas
* Using a lit splint to test for hydrogen.
* The positive result is a ‘squeaky pop’ sound.
4. Test for Carbon Dioxide Gas
* Bubbling the gas through limewater (calcium hydroxide solution).
* The positive result is the limewater turning cloudy or milky.

*** CHAPTERS ***
0:00 Introduction
0:21 Test for Chlorine
1:27 Test for Oxygen
1:58 Test for Hydrogen
2:24 Test for Carbon Dioxide
3:09 Recap

*** PLAYLISTS ***

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