Chapter 1 MATTER IN OUR SURROUNDINGS

What is sublimation ? write name of sublimate.

Sublimation Substances around us change state from solid to liquid and from liquid to gas on application of heat. But there are some that change directly from solid state to gaseous state and vice versa without changing into the liquid state. Liquid state is not present in sublimate because melting point and boiling point are …

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When a solid melts, its temperature remains the same, so where does the heat energy go?

The temperature of the system does not change after the melting point is reached, till all the ice melts.This happens even though we continue to heat the beaker, that is, we continue to supply heat. This heat gets used up in changing the state by overcoming the forces of attraction between the particles. As this …

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HOW DOES EVAPORATION CAUSE COOLING?

In an open vessel, the liquid keeps on evaporating. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings make the surrounding. when pour some acetone (nail polish remover) on palm, then feel cool.The particles gain energy from your palm or surroundings …

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FACTORS AFFECTING EVAPORATION

The rate of evaporation increases with–• an increase of surface area:We know that evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while puttingclothes for drying up we spread them out.• an increase of temperature:With the increase of temperature, more number of particles get enough kinetic …

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