State three reasons why you think air is a mixture and water is a compound.

air is a mixture because

  1. different gases mix together to from air and no new compound is formed
  2. air has variable composition
  3. air shows the properties of its constituent substances
  4. the constituents can be seperated by physical methods

water is a compound because

  1. H2 and O2 react to form water
  2. the composition of water is fixed
  3. the new substance,ie,water has entirely different properties from H2 and O2
  4. the constituents of water can be seperated by chemical or electrochemical reactions only

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