Discussion
Which of the following sets comprises chemical changes ?
Answer: D
The set of chemical changes is rusting of iron, burning of paper, digestion of food.
In a chemical change new substances are formed. Rusting forms iron oxide, burning paper forms ash, carbon dioxide and water vapour, and digestion breaks food into simpler substances. None can be reversed by simple means.
Each other set includes a physical change: boiling water and breaking glass change only state or shape; dissolving salt or sugar in water can be reversed by evaporation; shredding paper changes only its size.
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