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7th CBSE
IMPORTANT
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The properties of compounds are different from the properties of their constituent .

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Important Questions on Physical and Chemical Changes

MEDIUM
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 4

What kind of change is melting of wax ?

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7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 7

Write the chemical formulae of calcium carbonate. 

EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 8
CuSO4 is the chemical formula for _____.
EASY
7th CBSE
IMPORTANT
New Science Ahead>Chapter 6 - Physical and Chemical Changes>Exercises>Q 1
An element is made of only one kind of atom.
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.