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Question
Select the chemical changes from the following list of changes
Change of seasons
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Solution
Change of season is a PHYSICAL change, only change in temperature is seen and is a reversible change.
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Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
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
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State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Sublimation is classified as a physical change. Why ?
Fill in the blank with the appropriate word of the statement given below:
Germination of seeds is considered a __________ change.
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
Natural changes which take place in nature on their own, are beyond the control of human being.
Give two examples for the following case:
Physical changes which are not reversible
