$A$ small amount of quicklime is added to water in a beaker.
$(a)$ Name and define the type of reaction that has taken place.
$(b)$ Write the balanced chemical equation for the above reaction. Write the chemical name of the product obtained.
$(c)$ State two observations that you will make in the reaction.

(N/A) This is a combination reaction. It is defined as a reaction in which a single product is formed from two or more reactants.
$(b)$ The balanced chemical equation is: $CaO(s) + H_2O(l) \rightarrow Ca(OH)_2(aq)$. The chemical name of the product obtained is calcium hydroxide.
$(c)$ Two observations made during the reaction are:
$(i)$ The reaction occurs vigorously with the evolution of heat (exothermic reaction).
$(ii)$ The beaker becomes hot to the touch due to the release of thermal energy.