Test for gases

• How can you test for oxygen?

  Will relight a glowing splint.
• How can you test for hydrogen?

  Make a squeaky pop sound when exposed to a lit splint.
• How can you test for carbon dioxide?

  Bubbled trough limewater and CO2 will turn the limewater cloudy.
• How can you test for chlorine gas?

  Damp blue litmus paper will turn red the bleach to white.