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Respiration is an example of a physical change.

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Important Questions on Physical and Chemical Changes

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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What is corrosion? 
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Which of the following is not an effect of heating a substance?
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
When water is cooled, its particles start moving faster.
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why does heating lead to expansion of matter?
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What happens to a metal when it is cooled?
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Among the following, maximum expansion on heating will be shown by
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
When a substance is cooled, the movement of its particles.
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What is the increase in the volume of a substance called?
HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Give two applications of expansion and contraction of materials.
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Write and explain two examples where the expansion of solids is applied. 
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why are gaps left between rails on a railway track?
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
On heating the volume/size of most substances _____(increases/decreases).
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
How is a metal rim fixed tightly over a wooden wheel?
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
The decrease in the size of matter on cooling is called.
EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
What is the effect of cooling on metals?
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Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Why can a tight metallic lid on a glass bottle be opened easily if immersed in hot water for some time?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

Differentiate between the following:

Expansion and contraction.

HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

Look at the given set-up and describe what is being shown.

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HARD
Science>Chemistry>Physical and Chemical Changes>Chemical Changes

Look at the given set-up and describe what is being shown.

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EASY
Science>Chemistry>Physical and Chemical Changes>Chemical Changes
Can the changes that a metal undergoes during heating and cooling be reversed?