Name: Chemical Reactions and Their Characteristics
Uploaded: 2019-07-19
Duration: 3 min 32 s
Description: Have you seen that a piece of iron left outside begins to rust in some time? This is a chemical reaction taking place. Watch the video to learn about chemical reactions.

Question

Give examples to explain the difference between changes that can or cannot be reversed.

Accepted Answer

Reversible Changes Irreversible Changes

Changes that can be reversed and original shape and size of the substance can be obtained after the change has occurred. This kind of changes generally includes physical changes. Changes that cannot be reversed and the original substance is not obtained after the change has occurred. This kind of changes generally includes chemical changes.

Reversible Changes Irreversible Changes

Glowing of electric bulb. (It glows when switched on and stop flowing when switched off.)

Melting of ice is a reversible change as liquid water can again be frozen to ice.

Burning of paper or wood. (It gives smoke and ash, which cannot form paper or wood again).

Rusting of iron and growth of plants and animals.

Give examples to explain the difference between changes that can or cannot be reversed.

Important Questions on Changes Around Us

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