Q:
which of the following are chemical changes?
A) Cooking of Food
B) Digestion of Food
C) Freezing of water
D) Water is heated up
Answer & Explanation
Answer: A) A & B
Explanation: A) Cooking of Food ------ Chemical Change
B) Digestion of Food ----- Chemical Change
C) Freezing of water ----- Physical Change
D) Water is heated up ---- Physical Change
because here the chemical composition of the substance changes in A & B only.
Since we know that, If the chemical composition is changing then it is a chemical change and if the chemical composition is remaining the same, then it is a physical change.
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