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Question
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
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Solution
chemical change,
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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.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Fill in the blank with the correct word of the statement given below:
Sublimation of iodine is an example of _________ change.
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
Select the chemical changes from the following list of changes
Respiration in mammals.
Select the chemical changes from the following list of changes
The carbon cycle.
Select the chemical changes from the following list of changes
Change of seasons
When solute is dissolved in a solvent it forms a solution.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
