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7th CBSE
IMPORTANT
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What is the chemical formula of sodium oxide?

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Important Questions on Chemicals and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which gas is released in reaction of vinegar with baking soda?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which of the following elements exhibits valency 2?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which of the following represents a molecule of element?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 1
Write the chemical symbol for Sulphur.
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 2
Write the chemical symbol for Phosphorus.
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 4
Write the chemical symbol for Aluminium.
HARD
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 1
Differentiate between an element, a compound, and a mixture. Give atleast one relevant example for each.
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 2
What is atomicity? Give one example each for monoatomic, diatomic and tetra atomic elements.