A physical change alters physical properties like state, texture, or color but does not change molecular composition, and can typically be reversed. A chemical change alters molecular composition to form new substances and cannot be reversed. Examples of physical changes include loss of water of crystallization and melting of candle wax. Examples of chemical changes include burning of magnesium ribbon and formation of curds from milk.

1. PHYSICAL CHANGE
A change which alters some specific
physical property of the matter , like its
state, texture, magnetic or electrical
conditions or its colour without any
change in the composition of its
molecules, is called a physical change .
It also gets reversed if the cause
producing the change is removed.
Or changes in which no new substances
are formed.

2. Loss of water of crystallization(copper sulphate)

3. CHEMICAL CHANGE
A change which takes place in the state,
texture, colour, magnetic or electrical
properties along with change in the
composition of its molecules, is called a
chemical change . It does not get reversed
if the cause producing the change is
removed.
Or changes in which new substances are
formed.

4. Burning of magnesium ribbon
1 2
3 4

5. Differences between Physical and
Chemical changes
PHYSICAL CHANGE
No new substance
is formed.
CHEMICAL CHANGE
A new substance is formed.

6. PHYSICAL CHANGE
It is a temporary change
and can be easily reversed.
CHEMICAL CHANGE
It is a permanent change and
cannot be reversed

7. PHYSICAL CHANGE
Very little or no energy is
absorbed or given out
during a physical change
CHEMICAL CHANGE
A lot of energy is either given
out or absorbed during a
chemical change

8. PHYSICAL CHANGE
The mass of the substance does
not alter in a physical change
CHEMICAL CHANGE
The mass of a substance does get
altered in a chemical change

9. Q1) Give one example of a physical change.
Q2) Give one example of a chemical change.
Q3) Classify the following as physical and chemical changes:-
•Burning of candle wax ___________________________
•Melting of candle wax ___________________________
•Breaking a piece of chalk __________________________
•Germination of seed ______________________________
•Formation of curds from milk _______________________
•Condensation of steam ____________________________
Q4) A person eats a chocolate and then digests it . In doing so
there takes place a physical and a chemical change .identify
the changes and give a reason for your answer.