Question

what is the difference between physical and chemical change?​

Answer 1

Difference Between Physical and Chemical Change

Sl. No.

Differentiating Property

Physical Change

Chemical Change

1

Explanation

In a physical change, the molecules are rearranged while their actual composition remains same.

In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.

2

Example

Some example 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.

3

Reversibility

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

Chemical change is irreversible i.e. original substance cannot be recovered.

4

Formation of new substance

In physical change, no new substance is formed.

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

5

Type of Change

Physical change is a temporary change.

Chemical change is a permanent change.

6

Energy Production

In a physical change, no energy is produced.

In a chemical change, energy is produced (heat, light, sound, etc.)

7

Absorption of Energy

Physical change involves very little to no absorption of energy.

During chemical reaction, absorption and evolution of energy takes place.

8

Affects

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

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

Answer 2

HEYA MATE

PHYSICAL CHANGE--

IN PHYSICS CHANGE NO CHEMICAL REACTION TAKES PLACE

FOR EXAMPLE:-MELTING OF ICE

• BOILING OF WATER AND CHANGE INTO STEAM

CHEMICAL CHANGE:-

IN CHEMICAL CHANGE SOME TYPE OF REACTION CAN BE TAKE PLACE SUCH AS PPT REACTION,DISPLACEMENT REACTION IN THIS REACTIONS TWO OR MORE SUBSTANCES REACT WITH EACH OTHER OR DECOMPOSITION OF COMPOUND TAKE PLACE

FOR EXAMPLE:-Mg+O2=>2Mgo

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