(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron filings and sand
(d) Cooking of food
(e) Digestion of food
(f) Freezing of water
(g) Burning of a candle
The Chemical Changes are: (b) Rusting of iron, (d) Cooking of food, (e) Digestion of food, (g) Burning of a candle. Chemical changes involve the formation of new substances with different chemical properties also called irreversible changes.
Chemical changes are those that involve the rearrangement of atoms to form entirely new substances. Unlike physical changes, which can be reversed, chemical changes are permanent. Here are some key properties of chemical changes:
Formation of new substances, Irreversible changes, Energy changes, Change in state, Change in color, Formation of gas, Formation of a precipitate