Changes Around Us — Practice

Question 1

When ice melts to form water, the change occurs in its ____.

Accepted Answer

state.

Question 2

Drying of wet clothes in air is an example of a ____.

Accepted Answer

physical change.

Question 3

Air pollution leading to acid rain is a ____ change.

Accepted Answer

man-made.

Question 4

The boiling of an egg results in an ____ change.

Accepted Answer

irreversible.

Question 5

Bursting of crackers is a ____ change, whereas germination of seeds is a ____ change.

Accepted Answer

fast; slow.

Question 6

Differentiate a physical and a chemical change with an example.

Accepted Answer

A physical change forms no new substance (e.g. ice melting into water), while a chemical change forms a new substance (e.g. boiling an egg).

Practice — Changes Around Us