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7th CBSE
IMPORTANT
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Two hydrogen atoms linked to one oxygen atom in a definite manner form

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Important Questions on Physical and Chemical Changes

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7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 5
The chemical formula of table salt is 
EASY
7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 1

Correct the following statement:

In a physical change, a new substance is formed.

EASY
7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 2
A chemical reaction always involves formation of one or more substances.
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7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 3
A physical change can be reversed.
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7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 4
A chemical equation describes a chemical reaction.
EASY
7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 5
An element is made up of two or more kinds of atoms.
MEDIUM
7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 1
What are substances that react in a chemical reaction called?
MEDIUM
7th CBSE
IMPORTANT
EUREKA PLUS Revised Bringing Science to Life>Chapter 6 - Physical and Chemical Changes>EXERCISES>Q 2
Which type of change is usually not reversible?