MEDIUM
7th CBSE
IMPORTANT
Earn 100

Classify the following as physical and chemical changes:

Burning of kerosene oil in a stove.

Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>LET'S Learn And EVALUATE>Q 8

Identify the following as physical or chemical change.

Beating gold into thin foil.

EASY
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>LET'S Learn And EVALUATE>Q 1
Why do iron objects turn reddish brown when exposed to moist air?
MEDIUM
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>LET'S Learn And EVALUATE>Q 2
Write the differences between physical and chemical change. 
MEDIUM
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>LET'S Learn And EVALUATE>Q 3
Explain any three ways of preventing the rusting of iron.
MEDIUM
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>LET'S Learn And EVALUATE>Q 4
What is a chemical change? Name any four examples of chemical changes with their equation.
MEDIUM
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>LET'S Learn And EVALUATE>Q 5
What is crystallisation? How can you obtain sugar crystals? Explain.
HARD
7th CBSE
IMPORTANT
SCIENCE Class 7>Chapter 6 - Physical and Chemical Changes>HOTS>Q 1
You have dissolved a half teaspoonful of salt in half a glass of water. Will you be able to get the salt crystals from the solution? Write yes or no. Give reasons for your answer.