EASY
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Melting of wax is a chemical change.

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Important Questions on Changes Around Us

MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Why does heating lead to expansion of matter?
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Which of the following is not an effect of heating a substance?
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What does the physical change mean?
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Among the following, maximum expansion on heating will be shown by
HARD
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Give two applications of expansion and contraction of materials.
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What is the effect of cooling on metals?
MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Write and explain two examples where the expansion of solids is applied. 
MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Why is germination of a seed a chemical change?
HARD
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Dissolution of a sugar cube in water is a physical change while burning a sugar cube is a chemical change. Why?
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What does chemical change mean?
MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
How is a metal rim fixed tightly over a wooden wheel?
HARD
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Cutting a potato is a physical change while cooking it is a chemical change. Explain how.
HARD
Science>Chemistry>Changes Around Us>Physical and Chemical Changes

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

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MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes

Differentiate between the following:

Expansion and contraction.

MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What are the differences between a physical and a chemical change? 
MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What kind of change occurs when a pot is made from clay?
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What are physical and chemical changes? Give an example of each.
HARD
Science>Chemistry>Changes Around Us>Physical and Chemical Changes

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

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MEDIUM
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
What is the increase in the volume of a substance called?
EASY
Science>Chemistry>Changes Around Us>Physical and Chemical Changes
Select the material that undergoes the change.
  • A sheet of paper cut with a pair of scissors.