EASY
Earn 100

Which of these is a chemical change? Circle ‘Yes’ or ‘No’ to mark your response.

Is this a chemical change? Yes or No
Formation of clouds in the sky Yes/No
Drying of leaves Yes/No
A tadpole growing into a frog Yes/No

 

Important Questions on Physical and Chemical Changes

MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Under which conditions does a solute dissolve faster in the water?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Explain why burning of wood and cutting it into small pieces is considered as two different types of changes.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
What kind of change occurs when a pot is made from clay?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
A physical change cannot be reversed.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes

Distinguish between Physical and Chemical change.

HARD
Science>Chemistry>Physical and Chemical Changes>Physical 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>Physical and Chemical Changes>Physical Changes
In a physical change, new substances are formed.
EASY
Science>Chemistry>Physical and Chemical Changes>Physical Changes
What are physical and chemical changes? Give an example of each.
EASY
Science>Chemistry>Physical and Chemical Changes>Physical Changes
The soft egg becomes hard because of _____ of the water.
HARD
Science>Chemistry>Physical and Chemical Changes>Physical 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>Physical and Chemical Changes>Physical Changes
On heating, _____ process changes the state of matter.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Justify the statement giving examples — heating brings about chemical changes in some substances whereas physical changes in others.
EASY
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Select the material that undergoes the change.
  • A sheet of paper cut with a pair of scissors.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Write two differences between physical change and chemical change. Give an example of each.
EASY
Science>Chemistry>Physical and Chemical Changes>Physical Changes
What does the physical change mean?
HARD
Science>Chemistry>Physical and Chemical Changes>Physical 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>Physical and Chemical Changes>Physical Changes
When jelly cubes are heated, they melt. Identify it is a physical or chemical change.
 
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Physical Changes
What are the differences between a physical and a chemical change? 
HARD
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Cutting a potato is a physical change while cooking it is a chemical change. Explain how.
HARD
Science>Chemistry>Physical and Chemical Changes>Physical Changes
Addition of water to salt or sand is a physical change whereas to cement is a chemical change. Justify the statement.