SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Baking a cake is an example of
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Physical Change (Just changed phases)
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Chemical Change (can’t change it back)
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Once the cake is formed, we cannot get back the original batter and the chemical composition of cake is different from that of batter. In any physical change, the chemical composition of a substance does not change. Hence baking of cake is not a physical change but a chemical change.
Detailed explanation-2: -Chemical changes like this can’t be reversed. A baked cake is also an irreversible chemical reaction. It can’t go back to being a liquid batter. Physical changes are different to chemical changes.
Detailed explanation-3: -The balanced chemical reaction can be given as: 2 NaHCO 3 ( s ) → Na 2 CO 3 ( s ) + H 2 O ( g ) + CO 2 ( g ) ( Sodium bicarbonate ) ( Sodium carbonate ) ( Water ) ( Carbon dioxide ) .
There is 1 question to complete.