Give reasons for the following (i) Although we cannot see air, but it is a form of matter (ii) Air does not have fixed shape and volume (iii) Intermolecular space in solids is negligible (iv) Liquids take up the shape of the container
Answers
Answer:
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.
SOLUTION:
Chair, air, smell, almonds, cold drink and smell of perfume
Q 2.
Give reasons for the following observation:
The smell of hot sizzling food reaches you several metres away, but to get smell from cold food, you have to go close.
SOLUTION:
This happens because rate of diffusion of gas increases with increase in temperature. In case of hot food, diffusion of smell is faster whereas in case of cold food, diffusion is slower.
Q 3.
A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
SOLUTION:
The particles of water are held together by forces of attraction. It is the reason that the diver is able to cut through water in a swimming pool.
Q 4.
(A) Tabulate the differences in the characteristics of states of matter.
(B) Comment upon the following : rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density
SOLUTION:
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(A)
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