EASY
7th CBSE
IMPORTANT
Earn 100

How can you say that melting of ice is a physical change? 

Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>TRY OUT

Burning of paper is a chemical change. How? 

EASY
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>TRY OUT
Give four examples of chemical changes from your surroundings.
MEDIUM
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>TRY OUT

What are endothermic reactions? Give two examples. 

MEDIUM
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>TRY OUT

What is rusting? What are the conditions necessary for rusting?

 

EASY
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>Exercise>Q 1
Chemical changes are 
EASY
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>Exercise>Q 2
A reaction in which heat is absorbed is called a/an _____ reaction.
EASY
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>Exercise>Q 3
When copper sulphate reacts with iron, it forms 
EASY
7th CBSE
IMPORTANT
Focus Science in Everyday Life>Chapter 6 - Physical and Chemical Changes>Exercise>Q 4
Covering iron surface with zinc is called