Question

1. DEFINE PHYSICAL AND CHEMICAL CHANGE.
2. GIVE FOUR CHARACTERISTICS OF PHYSICAL AND CHEMICAL CHANGE.
3. WRITE THE CHANGES WHICH OCCUR IN OUR DAILY LIFE AND TRY TO CLASSIFY THEM AS PHYSICAL OR CHEMICAL CHANGE

Answer 1

Answer:

The change in which no new substance is formed and can be reversed to its original form is called physical change.

ex-boiling of water.

Explanation:

Chemical change in which new substance is formed.

Answer 2

Answer:

Explanation: 1. A change in which no new substances are formed and the change is reversible is called a physical change.

A change in which a new substance is formed and the change is irreversible is called a chemical change.

2. physical change :

A physical change is reversible.

It is a temporary change.

No new substances are formed.

The mass of the substances undergoing a physical change remains unaltered.

Chemical change:

A chemical change is irreversible

It is a permanent change

A new substance is formed

The mass of the substances undergoing a chemical is altered

3. physical change:

All changes in the states of matter is the common example., Others include the glowing of bulb , heating of an iron etc.

chemical change:

Burning of any substance, curdling of milk, charring of sugar, rusting of iron, photosynthesis, respiration.

An example where both the changes occur together is the burning of a candle.