Answer the questions in brief :
1. Is evaporation a surface phenomenon or a bulk phenomenon?
2. Define sublimation.
3. Name the temperature at which a liquid state of matter changes into a gaseous state.
4. Is evaporation exothermic or endothermic ?
5. Name the process responsible for cooling of water kept in a earthen pot during summers.
6. Why does the rate of evaporation increase with increase in temperature?
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Answers
Answer:
In evaporation the molecules of the liquid present on the surface of the liquid leave the liquid state and change into water vapour. Thus evaporation is a surface phenomenon
2.sublimation is the transition of a substance directly change into solid to gas without passing through the liquid.
3.The temperature that changes liquid state to gas is called as boiling point
4.Evaporation is endothermic because the liquid molecules must absorbs the heat in order to transform into gas molecule.
5.The water kept in the earth pot remain cool even in summer because earth pot has huge small holes water seeps out through them and evaporates from the surface of the pot. The energy is needed for evaporation is taken from the water and kept in the earth pot. As a result the water coolest during summer
6.The water molecules move rapidly when the water is heated. This makes the molecules escape faster. Higher temperature lead to increase vaporization as more molecules get knitic energy to convert into vapour.