State three reasons why you think air is a mixture and water is a compound.
air is a mixture because
- different gases mix together to from air and no new compound is formed
- air has variable composition
- air shows the properties of its constituent substances
- the constituents can be seperated by physical methods
water is a compound because
- H2 and O2 react to form water
- the composition of water is fixed
- the new substance,ie,water has entirely different properties from H2 and O2
- the constituents of water can be seperated by chemical or electrochemical reactions only
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