MEDIUM
7th CBSE
IMPORTANT
Earn 100

What do you understand by ‘rust’? Represent the chemical change that occurs during rusting.

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q D
What is stainless steel?
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q D
Define alloying.
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q D
What is meant by crystallisation?
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q D
How does galvanising prevent rusting?
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q E
Describe an activity to show the conditions necessary for rusting to take place.
MEDIUM
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q E
Explain the various methods by which rusting can be prevented.
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q E
Describe an activity to make crystals of copper sulphate.
HARD
7th CBSE
IMPORTANT
Science Booster>Chapter 7 - Physical and Chemical Changes>PRACTICE TIME>Q E
What are the characteristics of a chemical change?