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States of Matter

Short Answer Type

151.

What do you mean by state of dynamic equilibrium?

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152.

Separate portions of chloroform and water at the same temperature are poured on your hands. The chloroform feels colder. Account for this in terms of attractive forces.

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153.

Why is cooling caused in evaporation?

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154.
Explain why alcohol produces a greater cooling effect on skin that water does.

The boiling point temperature of alcohol (78°C) is less than that of water (100°C). This means that alcohol changes into vapour state faster than water. Consequently, alcohol will absorb the greater heat of vaporisation than done by water from the skin. In other words, alcohol will cause a greater cooling effect on the skin.

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