Calcium oxide is one of the main components of cement.

This building is made of cement.

Calcium is a nutrient necessary for strengthening bones.

He ate one apple.

Oxidation is a type of chemical reaction where a substance reacts with oxygen to form an oxide.

This compound turns red when it oxidizes.

Calcium carbide is a major raw material for acetylene gas.

We will use calcium chloride in this experiment.

This is my first question.

Aluminium oxide is widely used as a refractory and abrasive material.