chemical tests

• What is the test for hydrogen gas?

  
  

  • Collect Hydrogen gas in a test tube
  • Hold the test tube near a flame
  • A loud squeaky pop will occur
• What happens to damp blue litmus paper when chlorine is present?

  Turns white
• What is the test for oxygen gas?

  Relight glowing splint
• What is the test for carbon dioxide?

  Lime water test
• What are the flame test colors for lithium, sodium, potassium, iron, and copper?

  • Lithium: Red
  • Sodium: Yellow
  • Potassium: Purple
  • Iron: Brown
  • Copper: Blue/Green
• What color precipitate indicates Iron (III)?

  Brown
• What color precipitate indicates Iron (II)?

  Green
• What color precipitate indicates copper?

  Blue
• How do you test for halides and what are the results?

  • Add nitric acid and silver nitrate
  • Chloride: White precipitate
  • Bromide: Cream precipitate
  • Iodide: Yellow precipitate
• What is the test for sulphates?

  Add hydrochloric acid and barium chloride
• What is the result of the sulphate test?

  White precipitate
• What happens when hydrochloric acid is added to carbonates then bubbled through limewater

  It goes cloudy
• What is the test for water?

  Add anhydrous copper sulphate
• What color change indicates the presence of water when using anhydrous copper sulphate?

  White to blue
• ammonia ions test


  add sodium hydroxide and red litmus paper will go blue