Chemical changes harder questions

• Metal carbonate + acid make

  Salt + water + carbon dioxide
• Metal + acid

  Salt + hydrogen
• What is the test for hydrogen

  1.Get a lit splint

  2.burns with a squeaky pop
• Test for carbon dioxide

  1.Bubble through limewater(calcium hydroxide)

  2.Goes cloudy if carbon dioxide present
• Oxidation is_____ and reduction is ___

  Loss

  Gain
• What colour does litmus paper turn when its -acidic -neutral -alkaline


  Red

  Purple

  Blue
• What colour does methyl orange turn when its -acidic -neutral -alkaline

  Red

  Yellow

  Yellow
• What colour does phenolphthalein turn when its-acidic -neutral -alkaline


  Colourless

  Colour less

  Pink
• metal + steam


  metal oxide + hydrogen
• metal + water


  metal hydroxide + reaction
• metal + steam


  metal oxide + hydrogen