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c. Sublimation: It is the process of changing the solid state into the gaseous state on heating and vice-versa on cooling. Turning the gaseous state back into the solid state is known as Deposition. Eg. Napthalene balls, camphor, etc.
d. Boiling Point: It is the fixed temperature at which a liquid starts to boil. The boiling point of water is 100⁰ C.
e. Freezing Point: It is the fixed temperature at which a liquid state changes into its solid state on cooling. The freezing point for H2O is 0⁰ C.
Q3. Evaporation: It is the process of changing a liquid state into its vapors state on heating. Evaporation takes place at all temperatures. Alcohol evaporates at 78⁰C.
The factors affecting the rate of evaporation are:
1. Humidity around the liquid.
2. The air blown on the surface of the liquid.
3. Volatile the liquid.
4. Larger the surface area.
Q4. Evaporation is an endothermic reaction, henceforth it requires heat. It takes away the heat from its surroundings and produce a sensation of cooling. Eg. We feel cool, when air blows over our body sweat.
I knew just these many questions only. Hope they helped you.
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