MEDIUM
7th CBSE
IMPORTANT
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What is stainless steel? How is stainless steel made? State an important property of stainless steel.

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 19
State three differences between a physical change and a chemical change.
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 20
Write a word equation to represent the process of rusting of iron. Also write the chemical symbols and formulae of all the substances involved.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 21
Explain why, explosion of a firework (such as cracker) is said to be a chemical change.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 22
Explain why, melting of ice to form water is said to be a physical change.
MEDIUM
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 23
What is meant by crystallisation? State its one use.
HARD
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 24
Describe how crystals of copper sulphate are prepared.
EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 25
Give example of a chemical change which occurs by the action of heat.
EASY
7th CBSE
IMPORTANT
AWARENESS SCIENCE for Seventh Class>Chapter 6 - Physical and Chemical Changes>Short Answer Type Questions>Q 25
Give example of a physical change which occurs by the action of heat.