Question

Solution chapter 2 matter ​

Answer 1

Answer:

Question 1.

Define:

(a) Matter

Solution:

(a) Matter is anything that occupies space, has space and can be perceived by our senses.

Example: Air, Book.

(b) Intermolecular force of attraction

Solution:

(b) Due to the intermolecular force of attraction, the molecules of matter are always in motion and attract each

other with a force, by which they are held together.

Question 2.

What are the three states of matter? Define each of them with two examples.

Solution:

The three states of matter are:

Solids, liquids and gases

• Solids - A solid has a standard volume and shape. Example- wood, stone, iron, ice etc.

• Liquid - A liquid has a definite volume but not a definite shape. Example- water, juice, milk, oil, etc.

• Gases - A gas neither has definite shape nor a definite volume. Example- air, hydrogen, oxygen,water vapour etc.

Question 3.

Define interconversion of states of matter. What are the two factors responsible for the change of states

of matter?

Explanation:

A process in which things changes from one state to another and get back to the original state, without

any change in its chemical composition is called interconversion state of matter.

Two factors responsible for the change of state of matter are: change in

• Temperature

• Pressure

Question 4.

State the main postulates of kinetic theory of matter.

Solution:

The main postulates of the theory are:

1. Matter is made up of very small particles.

2. The constituent particles of a kind of matter are identical in all respects.

3. These particles have space or gaps between them which is known as interparticular or intermolecular space.

4. There exists a force of attraction between the particles of matter which holds them together. This force of

attraction is known as interparticular or intermolecular force of attraction.

5. Particles of matter are always in a state of random motion and possess kinetic energy, which increases with

increase in temperature and vice-versa.

Question 5.

What happens to water if

(a) It is kept in a deep freezer

(b) It is heated

Explain the phenomenon of change of state of water.

Solution:

(a) When water is placed in a deep freezer, it is cooled and changed into ice at 0°C ice.

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