MEDIUM
7th CBSE
IMPORTANT
Earn 100

Identify if the given change is a chemical change or not. Give reasons for your answers.
Frying an egg

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F

Identify if the given change is a chemical change or not. Give reasons for your answers.
Combustion of petrol in a car

MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F

Identify if the given change is a chemical change or not. Give reasons for your answers.
Ironing of clothes

MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F

Identify if the given change is a chemical change or not. Give reasons for your answers.
Preparing custard from milk

MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F

Identify if the given change is a chemical change or not. Give reasons for your answers.

Drying wet hair

HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
An iron nail is taken to the moon. Another is kept near the Gateway of India, Mumbai, while the third one is kept near the Red Fort, Delhi. Compare the degree of rust formation on the three nails.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
The liquefied petroleum gas (LPG) is the gas which is used for cooking at home. In the cylinder it comes as a liquid. When it comes out from the cylinder, it become a gas (Change A). Then it burns (Change B). What are the differences between change A and B?
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
The decomposition of animal waste by anaerobic bacteria produces biogas (Change A). The biogas is then burnt as fuel (Change B). What are the similarities between the two changes?