Testing and Preparing Common Gases This includes CO2, O2, H2, NH3 and Cl2 4.0 / 5 based on 1 rating ? ChemistryTesting and analysing substancesGCSEEdexcel Created by: UpforrevisingCreated on: 11-12-12 19:17 How can you make H2? acid + metal ==> salt + hydrogen 1 of 17 How is H2 collected? 1) over water 2) UP into a gas jar 3) into a gas syringe 2 of 17 What is the test for H2? "Squeaky pop" noise with a lighted splint 3 of 17 How can you make O2? Decomposition of hydrogen peroxide (H2O2 ==> O2 and H2O) 4 of 17 How is O2 collected? 1) over water 2) DOWN into a gas jar 3) into a gas syringe 5 of 17 What is the test for O2? relights a glowing splint 6 of 17 How can you make CO2? React acid and carbonate 7 of 17 How is CO2 collected? 1) over water 2) DOWN into a gas jar 3) into a gas syringe 8 of 17 What is the test for CO2? It turns limewater from clear and colourless to cloudy white 9 of 17 How can you make NH3? base/ alkali + ammonium salt ==> salt + water + AMMONIA 10 of 17 How is NH3 collected? 1) into a gas jar 2) into a gas syringe 11 of 17 What is the test for NH3? ammonia turns damp pink litmus paper blue [colourless gas but pungent smell] 12 of 17 How is Cl2 collected? 1) over water 2) DOWN into a gas jar 3) into a gas syringe 13 of 17 What is the test for Cl2? chlorine turns damp blue litmus to pink, and immediatly bleaches it white [pale yellow green gas] 14 of 17 Why can't NH3 be collected over water? It is too soluble. 15 of 17 Why are some gases collected up a gas jar and some down? Dense gases are collected down because they sink and visa versa. 16 of 17 Visit : http://because-chemistry-is-my-life.blogspot.co.uk/ GOOD LUCK WITH ALL YOUR EXAMS!! : ) 17 of 17
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