Question

(i) Arrange the following substances in increasing order of force of attraction between the
particles. (a) water (b) hydrogen (c) sand
(ii) Why does the temperature remain constant at the melting point?

Answer 1

The answers of the given questions are as follows -

i) The increasing order of force of attraction between the given particles :

Hydrogen < Water < Sand

- The hydrogen is gaseous,water is liquid and sand is solid.

- Now,the solid particles have greatest amount of intermolecular bond strength. Liquids have slightly less amount of intermolecular bond strength than the solids and gases gave even less amount of intermolecular bond strength than the liquids.

ii) The temperature remains constant at the melting point because the externally supplied extra heat energy is only used (by the system itself) for changing the state of the of matter (ie. Solid to Liquid) and that's why temperature of the system remains constant.

Answer 2

Explanation:

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