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7th CBSE
IMPORTANT
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An element is made of only one kind of atom.

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Important Questions on Physical and Chemical Changes

EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 2
Carbon dioxide is made of carbon and oxygen.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 3
A mixture is a substance that has two or more elements in a fixed ratio.
MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 4
Do the components of a mixture retain their properties in a mixture?
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 5
A symbol can be used to represent an element or an atom of an element.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 6
The number of atoms in a molecule of an element is called its formula.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 7
The number of atoms of each element should be same on each side of a balanced equation.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 8
Rusting is a physical change.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 9
A physical change can be reversible or irreversible.