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1. as sodium chloride is not a sublimate solid is cannot transfer its state drectly from solid to gas.
2. this is due to latent heat. suppose you are boiling water to change its state from liquid to gas, the heat energy will be consumed in the change of its state only i.e, its temperature will not rise from 100 degree until it changes into gas.
3.This is because of the process of diffusion that happens as soon as the perfume is released into the air. Being a compressed chemical, once the perfume is sprayed, it turns into gas and its particles get mixed with the air particles very quickly.
4. As a liquid is heated, the average kinetic energy of its particles increases. The rate of evaporation increases as more and more molecules are able to escape the liquid's surface into the vapor phase. ... The boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure.
5.this is because a swimmer made its body streamlined while swimming and by this he/she reduces the friction over his/her body.
6.When water solidifies to ice, heat is liberated into surroundings. ... The process of converting liquid to ice is called as freezing. During freezing, the energy lost by water molecules is gained by the surrounding molecules. Hence surrounding air becomes warm.
7. this is because the molecules of solids have very low intermolecular gaps and a strong intermolecular attraction between them .
8. This phenomenon is called fusion because when two separate solid objects made from the same substance are melted, they can get mixed together into a new one (they fuse).
9. this is because gas is not rigid or they don't have a strong intermolecular attraction between them, that is why they can weigh the same but can't be equal in density.
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