Chemistry
Give a reason why -
(a) Freezing of water is a reversible change while burning of a candle an irreversible change.
(b) Change of seasons is a periodic change while change of weather is a non-periodic change.
Phy & Chem Changes
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Answer
(a) Freezing of water is a reversible change because this change can be reversed by change in conditions i.e., if temperature is lowered freezing occurs and if temperature is raised melting occurs.
On the other hand, burning of a candle is an irreversible change, because it cannot be reversed by change in conditions.
(b) Change of seasons is a periodic change because it occurs periodically at regular intervals whereas change of weather is a non-periodic change because it does not occur at regular intervals.
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