Discussion
Which of the following are chemical changes?
(a) Rusting of iron (b) Burning of magnesium ribbon (c) Melting of ice (d) Dissolving sugar in water
Answer: A
The chemical changes are (a) and (b).
Rusting forms hydrated iron(III) oxide and burning magnesium forms magnesium oxide - new substances, and neither change is reversible by simple physical means. Melting ice and dissolving sugar produce no new substance and are reversed by freezing and by evaporation.
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