Physical And Chemical Changes

Question 1

What are slow changes?

Answer 1

The changes that take longer time to complete are called slow changes. For ex:- rusting of iron,change of seasons, etc.

Question 2

What are fast changes?

Answer 2

The changes that take place in a short interval of time are called fast changes. For ex:- bursting of crackers, lightning of an electric bulb, etc.

Question 3

What are natural changes?

Answer 3

Some changes that take place in nature themselves are called natural changes. For ex:- change of day and night, growing of a tree, etc.

Question 4

What are man-made changes?

Answer 4

Any change that occurs due to the efforts of human beings is called a man-made change. For ex:- cooking of food, jewellery from gold, etc.

Question 5

What are periodic changes?

Answer 5

Changes th that are repeated at regular intervals of time and not randomly are called periodic changes. For ex:- change of day and night, change of seasons etc.

Question 6

What are non-periodic changes?

Answer 6

Changes that are not repeated at regular intervals are called non periodic changes. For ex:- earthquakes, a person becoming sick, etc.

Question 7

What are reversible changes?

Answer 7

When a change in a substance can be reversed by changing the conditions, it is said to be a reversible change. For ex:- water freezing into ice, etc.

Question 8

What are irreversible changes?

Answer 8

If a substance cannot be brought back to its original state after a change, it is said to be an irreversible change. For ex:- burning of paper, cooking of food, etc.

Question 9

What are the two broad classifications of changes?

Answer 9

Physical changes and chemical changes