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JAMB Chemistry 1998 Question 1

Question 1

Separation of Mixtures

The addition of water to calcium oxide leads to

  1. A.a physical change
  2. B.a chemical change
  3. C.the formation of a mixture
  4. D.an endothermic change.
Show the answer and explanation

Answer: B (a chemical change)

Explanation

Water reacts with calcium oxide to form a new substance, calcium hydroxide (slaked lime), with a lot of heat given out. A new substance means a chemical change.