MEDIUM
7th CBSE
IMPORTANT
Earn 100

Write balanced chemical equation for the following chemical reaction:

sodium+chlorine→sodium chloride

Important Questions on Chemicals and Chemical Changes

EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Remember>Q 3

Write balanced chemical equation for the following chemical reaction:

aluminium+chlorine→aluminium chloride

MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Discuss
Is burning of a candle is physical change, a chemical change or both?
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Remember>Q B
What are the two essential conditions for rusting?
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Remember>Q B
How can rusting of iron objects be prevented?
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Remember>Q B
Which gas is evolved in the reaction between baking soda and vinegar?
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Remember>Q B
Why blue-coloured copper sulphate solution acquires a green colour when iron fillings are added to it?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Let's Remember>Q B
How is common salt obtained?
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which of the following cannot be broken down into simpler substances by chemical means?