Question

answer the following questions in brief. 1. State four properties of a physical change.
2. State four properties of a chemical change.
3. Give an example of a chemical change in which there is a change of colour that takes place.
4. Write the factors that cause rusting.
5. Why do cut vegetables take up a brown colouration when exposed in air? 6. Lime water turns milky on passing carbon dioxide gas into it. Explain​

Answer 1

Explanation:

answer the following questions in brief. 1. State four properties of a physical change.

2. State four properties of a chemical change.

3. Give an example of a chemical change in which there is a change of colour that takes place.

4. Write the factors that cause rusting.

5. Why do cut vegetables take up a brown colouration when exposed in air? 6. Lime water turns milky on passing carbon dioxide gas into it. Explain

Answer 2

1st Question

Qno1. State four properties of a

physical change?

Ans. Four characteristics of the physical

change are :

1. No new substances are formed.

2. The properties of the substance

remain the same even when there

is a change in the physical state.

3. Some physical changes are

reversible, whereas some are

irreversible.

4. Heat may or may not be evolved or

absorbed during a physical change.

2nd Question

Qno2. State four properties of a

chemical change?

Ans. Four properties of a chemical

change are :

1. Change of colour : In some

reaction a chemical change is

indicated by a change in colour.

2. Formation of a precipitate :

Sometimes, when two clear

solutions combine an insoluble

solid is formed that settles down is

precipitate.

3. Evolution of a gas : Sometimes, a

gas is released during a chemical

reaction.

4. Generation of light and sound :

Explosion of a firecracker is a

chemical change that produces

light, sound and heat.

3rd Question

Qno3. Give an example of a chemical

change in which there is a change

of colour that takes place ?

Ans. Browning of fruits and vegetables

are the chemical change.

4th Question

Qno4. Write the factors that cause

rusting ?

Ans. The two factors that causes

rusting are :

1. Air and Water.

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