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1. a) Sugar is a pure substance because it cannot be separated and formed of only single type of molecule. In the case of milk it can be separated by physical process into its components. It has components like water, fat, proteins etc.
b) iron and ice are pure substances,
but wood and brick are not.
2.(a) Sugar in water
(b) Air
(c) Oil in water
3.sand(solid)<water(liquid)<oxygen(gas)
4. There will be no change in volume as the salt gets into the spaces present between the water molecules.
5.The temperature remains constant during the boiling of water even though heat is supplied continuously. This is because,the heat supplied is absorbed by the water particles and this heat increases their kinetic energy. Thus, because of an increase in kinetic energy, the bond between the water particles are cut down and they move more freely, compared to water. Hence, they become gas. So, this is why the temperature remains constant even though heat is supplied continuously to the water.
6. sublimation
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