In this GCSE science chemistry video we look at the tests for gases oxygen, hydrogen, carbon dioxide and chlorine. Learning these tests is crucial for exams as testing gases is a regular question In paper 2. Gas tests include: Squeaky pop test for hydrogen Relight a burning splint in oxygen Limewater test for Carbon dioxide (made with calcium carbonate - not calcium chloride as I accidentally say in the video) Litmus test for chlorine Time stamps: 0:12 Test for oxygen gas 1:01 Test for hydrogen gas 2:11 Test for carbon dioxide 3:43 Test for chlorine gas GCSE Chemistry GCSE combined Science