Question

Write three differences between physical and chemical changes

along with the two examples in each case​

Answer 1

Answer:

A chemical change is a permanent change. A Physical change affects only physical properties i.e. shape, size, etc. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

Answer 2

Answer:

Differences Between Physical and Chemical Change-

Physical Change:-

When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged.

chemical change:-

When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances.

physical change-

Physical change is a temporary change. A chemical change is a permanent change.

A Physical change affects only physical properties i.e. shape, size, etc.

chemical change -

Chemical change both physical and chemical properties of the substance including its composition.

physical change-

A physical change involves very little to no absorption of energy.

chemical change-

During a chemical reaction, absorption and evolution of energy take place.

physical change-

Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

chemical change-

A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

physical change-

Generally, physical changes do not involve the production of energy.

chemical change-

Chemical changes usually involve the production of energy (which can be in the form of heat, light, sound, etc.)

physical change-

In a physical change, no new substance is formed.

chemical change-

A chemical change is always accompanied by one or more new substance(s).

physical change-

Physical change is easily reversible i.e original substance can be recovered.

chemical change-

Chemical changes are irreversible i.e. original substance cannot be recovered.

Thus, it can be understood that the primary difference between physical and chemical changes is that physical changes are reversible whereas chemical changes are usually not.

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