(a) and (c) are physical changes.
(b) and (d) are chemical changes.
Question
Classify the following processes into physical or chemical changes: a. Beating of aluminium metal to make aluminium foil. b. Digestion of food. c. Cutting of a log of wood into pieces. d. Burning of crackers.
- Physical and chemical changes CBSE Class 7
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If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust. a. Do you think rust is different from iron? b. Can you change rust back into iron by some simple methods? c. Do you think formation of rust from iron is a chemical change? d. Give two other examples of a similar type of change.
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