MEDIUM
7th ICSE
IMPORTANT
Earn 100

Give scientific reason for the following.

Curdling of milk is a chemical change.

Important Questions on Physical and Chemical Changes

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q 4

Give scientific reason for the following.

Fermentation is a chemical change.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q 5

Give scientific reason for the following.

Sublimation is a physical change.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q 6

Give scientific reason for the following.

Burning of fuels may be an undesirable change.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q 7

Give scientific reason for the following.

Rotation of a fan is a periodic change.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q 8

Give scientific reason for the following.

Burning of cooking gas is a fast change.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q [a]

Look at the figure below which shows three situations (a) burning candle, (b) an extinguished candle and (c) melting wax.

Question Image

Which of these shows a reversible change and why?