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Q: Rusting of iron is a common example of which?
  • A. Physical change
  • B. Exothermic change
  • C. Heat change
  • D. Chemical changes
Correct Answer: Option D - When a substance combines with another substance to form a new substance, it is called chemical change. Rusting of iron is an example of chemical change. Other examples of chemical changes are:  Milk conversion to yogurt.  Burning of incense sticks.  Burning of wood.  Digestion of food.
D. When a substance combines with another substance to form a new substance, it is called chemical change. Rusting of iron is an example of chemical change. Other examples of chemical changes are:  Milk conversion to yogurt.  Burning of incense sticks.  Burning of wood.  Digestion of food.

Explanations:

When a substance combines with another substance to form a new substance, it is called chemical change. Rusting of iron is an example of chemical change. Other examples of chemical changes are:  Milk conversion to yogurt.  Burning of incense sticks.  Burning of wood.  Digestion of food.