Question

physical change and chemical change
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Answer 1

Answer:

Chemical Changes. Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.

Explanation:

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Answer 2

Answer:

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A physical change is a temporary and easily reversible change in which the physical properties (e.g., physical state, shape, size, appearance, density etc.) of a substance change. Some physical changes are: glowing of an electric bulb, sublimation of iodine, melting of wax, melting of sulphur, evaporation of water and other liquids, formation of dew, crystallization of salt, freezing of liquids, drying of wet clothes, bending of a glass tube, etc.

Some Common Examples of Physical Changes

Preparing a solution of salt and sugar.

Powdering chalk stick.

Powdering crystals of salt and sugar.

Changing of water into steam by boiling

Magnetization of iron.

Condensation of water vapour, such as the formation of clouds, mist, fog, etc.

A chemical change is a permanent change in which the chemical composition of a substance is changed, and one or more new substances with different chemical compositions and different properties are formed. The change is not easily reversible. e.g., burning of carbon, burning of sulphur, burning of wax, burning of carbon, curdling of milk, digestion of food etc.

Some common examples of chemical changes are:

1. Cooking of food.

2. Food turning bad after a few days.

3. Curdling of milk.

4. Fading the colours of clothes.

5. Ripening of fruits.

Explanation: