You can make calcium chloride plus water by reacting calcium oxide (CaO) with hydrochloric acid (HCl). Here's the balanced chemical equation:

CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)

Explanation:

* Calcium oxide (CaO) is a white solid commonly called quicklime.

* Hydrochloric acid (HCl) is a strong acid.

* Calcium chloride (CaCl₂) is a soluble ionic compound.

* Water (H₂O) is a liquid.

Reaction Process:

1. When calcium oxide reacts with hydrochloric acid, the following happens:

- The calcium oxide reacts with the hydrogen ions (H+) from the hydrochloric acid, forming calcium ions (Ca²⁺).

- The chloride ions (Cl⁻) from the hydrochloric acid combine with the calcium ions, forming calcium chloride.

- The remaining hydrogen ions react with the oxygen atoms from the calcium oxide, forming water.

This reaction releases heat and is considered an exothermic reaction.