EASY
Earn 100

Burning of a paper is a change.

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Important Questions on Changes Around Us

EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What is corrosion? 
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
What kind of change occurs when a pot is made from clay?
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Under which conditions does a solute dissolve faster in the water?
HARD
Science>Chemistry>Changes Around Us>Classification of Changes
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
A physical change cannot be reversed.
HARD
Science>Chemistry>Changes Around Us>Classification of Changes
Classify the changes involved in the following processes as physical or chemical changes:
(A) Photosynthesis
(B) Dissolving sugar in water
(C) Burning of coal
(D) Melting of wax
(E) Beating aluminium to make aluminium foil
(F) Digestion of food
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
In a physical change, new substances are formed.
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What are physical and chemical changes? Give an example of each.
HARD
Science>Chemistry>Changes Around Us>Classification of 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>Classification of Changes
The soft egg becomes hard because of _____ of the water.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes

Distinguish between Physical and Chemical change.

EASY
Science>Chemistry>Changes Around Us>Classification of Changes
On heating, _____ process changes the state of matter.
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
Select the material that undergoes the change.
  • A sheet of paper cut with a pair of scissors.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Write two differences between physical change and chemical change. Give an example of each.
EASY
Science>Chemistry>Changes Around Us>Classification of Changes
What does the physical change mean?
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Justify the statement giving examples — heating brings about chemical changes in some substances whereas physical changes in others.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
Explain why burning of wood and cutting it into small pieces is considered as two different types of changes.
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
When jelly cubes are heated, they melt. Identify it is a physical or chemical change.
 
MEDIUM
Science>Chemistry>Changes Around Us>Classification of Changes
What are the differences between a physical and a chemical change? 
HARD
Science>Chemistry>Changes Around Us>Classification of Changes
Cutting a potato is a physical change while cooking it is a chemical change. Explain how.