Test For Gases

• What is the purpose of today's video?

  To test for four carbon gases
• What is the first gas tested for in the video?

  Chlorine
• What is needed to test for chlorine gas?

  A test tube full of sample gas
• What happens to blue litmus paper when chlorine is present?

  It turns from blue to white
• Why might the litmus paper briefly turn red before turning white?

  Chlorine forms hydrochloric acid with water
• What is used to test for oxygen gas?

  A glowing splint
• What safety precaution should be taken when testing for chlorine?

  Wear a mask or use a fume cupboard
• What happens to a glowing splint in the presence of oxygen?

  It relights
• What is the test for hydrogen gas?

  A burning splint produces a squeaky pop
• What reaction occurs when hydrogen burns?

  It forms water with oxygen
• What is the test for carbon dioxide gas?

  Bubbling gas through lime water
• What happens to lime water when carbon dioxide is bubbled through it?

  It goes cloudy
• What is the final summary of the tests for the gases?

  Chlorine bleaches paper, oxygen relights splint
• Why does lime water go cloudy when carbon dioxide is present?

  Calcium carbonate forms as a solid
• What are the tests for the four gases mentioned in the video?

  • Chlorine: Blue litmus paper turns white
  • Oxygen: Glowing splint relights
  • Hydrogen: Squeaky pop with lit splint
  • Carbon dioxide: Lime water goes cloudy