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7th CBSE
IMPORTANT
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Rusting of iron is a chemical change.

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Important Questions on Physical and Chemical Changes

HARD
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q E

Properties of physical and chemical changes are given below. Sort the properties of physical and chemical changes into the correct columns.
1. New substances are formed.                        5. It is usually permanent.
2. Precipitation of water is an example of this.               6. It is usually temporary.
3. Products have new composition.                  7. Burning of LPG is an example of this
4. Composition of substances remains same.  8. It is reversible.

Physical change Chemical change
1. 1.
2. 2.
3. 3.
4. 4.
HARD
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q F
Some techniques to prevent corrosion are mentioned in Box 2. Find the actual term used for them and examples of each technique from Box 1.
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HARD
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q G

G. Solve the following crossword puzzle.
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EASY
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q A

Write any two features of a physical change.

EASY
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q A
Write any two features of chemical change.
MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q A
How are alloys made? Name one alloy.
HARD
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q A

What is the harmful effect of corrosion?

MEDIUM
7th CBSE
IMPORTANT
Frank Everyday Science>Chapter 6 - Physical and Chemical Changes>Let's revise>Q A

Define electroplating.