Identification of common gases

• What sound is produced when testing for hydrogen with a burning splint?

  A 'squeaky pop' sound
• Why does a burning splint create a 'squeaky pop' sound when testing for hydrogen?

  Because hydrogen burns rapidly
• What is used to test for oxygen?

  A glowing splint
• What happens to a glowing splint when it is inserted into a test tube of oxygen?

  The splint relights
• How is carbon dioxide tested?

  By bubbling the gas through limewater
• What is the observable result when carbon dioxide is bubbled through limewater?

  It turns milky (cloudy)
• What is used to test for chlorine gas?

  Damp litmus paper
• What happens to damp litmus paper when it is exposed to chlorine gas?

  It is bleached and turns white
• What are the tests for the four gases: hydrogen, oxygen, carbon dioxide, and chlorine?

  • Hydrogen: Burning splint produces a 'squeaky pop'
  • Oxygen: Glowing splint relights
  • Carbon Dioxide: Bubbles through limewater turns milky
  • Chlorine: Damp litmus paper bleaches and turns white