MEDIUM
7th CBSE
IMPORTANT
Earn 100

Give an example of displacement reaction.

Important Questions on Physical and Chemical Changes

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

In the following boxes, add a reverse arrow wherever a change can be reversed.
Question Image

HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
When a candle burns, both physical and chemical changes take place. How?
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
Setting of curd is a chemical change. Explain.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
What do you observe when you mix vinegar and baking soda? How do you perform a test for the evolving gas?
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 7 - Physical and Chemical Changes>ASSESSMENT ZONE>Q F
Describe how crystals of copper sulphate are prepared.
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.
Cutting grass
 
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.
Burning toast

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.
Making tea with a tea bag and water.