8.2 Identification of common gases

• What is the test for hydrogen gas?


  Use a burning splint in the gas
• What sound indicates the presence of hydrogen gas?


  A 'squeaky pop' sound
• How is oxygen gas tested?


  Use a glowing splint inserted into the gas
• What happens to a glowing splint in oxygen gas?


  It relights in oxygen
• What is the test for carbon dioxide gas?


  Bubble the gas through limewater
• What is the result of bubbling carbon dioxide through limewater?


  It turns milky (cloudy)
• How is chlorine gas tested?


  Use damp litmus paper
• What happens to damp litmus paper in chlorine gas?


  It bleaches and turns white
• What are the tests for different gases?


  • Hydrogen: Burning splint → 'squeaky pop'
  • Oxygen: Glowing splint → relights
  • Carbon Dioxide: Limewater → turns milky
  • Chlorine: Damp litmus paper → bleaches white