(a) (i) Folding of paper
(ii) Melting of ice
(b) (i) Tearing of paper
(ii) Breaking of glass
(c) (i)Reaction between vinegar and baking soda
(ii) Burning of a matchstick
Question
Give two examples for each of the following cases: a. Physical changes which are reversible. b. Physical changes which are not reversible. c. Chemical changes.
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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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