[1 Mark Question Answer]

Question 11 Mark

Give two example of the following : The substances which do not change their state on heating.

Answer

Gases do not change their state on heating.
Example: $O_2.$

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Question 21 Mark

Give two example of the following : The substances which sublime.

Answer

Camphor, iodine, naphthalene, ammonium chloride, dry ice $($solid carbon dioxide$)$, etc.

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Question 31 Mark

Define of intermolecular force of attraction.

Answer

The molecules of matter are always in motion and attract each other with a force called intermolecular force of attraction due to which they are held together.

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Question 41 Mark

When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?

Answer

This is because there is some space between the particles of water in which the salt particles get accomodated when dissolved.

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Question 51 Mark

Define of matter.

Answer

Matter is anything which has mass, occupies space and can be percieved by our senses.
Example: Air, Book.

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Question 61 Mark

Define of Brownian motion.

Answer

Brownian motion: The haphazard, random motion of suspended particles on the surface of a liquid or in air is called ‘Brownian motion’.

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Question 71 Mark

Define of Diffusion.

Answer

Diffusion: The intermixing of two or more substances due to the motion of their particles in order to get a uniform mixture is called ‘diffusion’.

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