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Question
Define physical change. Give two examples for the above changes.
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Solution
Physical change: A temporary change in which no new substance is formed, the composition of substance remains the same, though its state, shape and size may change.
Example of physical change:
- Change of water into its vapours.
- Heating of iron rod.
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Solve this crossword by using the clues that follow.

Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
shaping a piece of glass —
State whether the following is physical or chemical changes.
photosynthesis —
Write true or false
Burning of sugar is a temporary change.
Name two reversible changes.
Give two examples of periodic changes.
The rusting of an iron object is called :
Define a chemical change. Give two examples of the above changes.
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Fill in the blank with the appropriate word of the statement given below:
If a change is permanent and irreversible it is considered a _________ change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Select the chemical changes from the following list of changes
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Give the reason why the following is considered as chemical changes.
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Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
What is the difference between dissolution of sugar and burning of sugar ?
Natural changes which take place in nature on their own, are beyond the control of human being.
