This compound was made by the chemical combination of two different elements.

These two elements chemically combine to create a new substance.

Acidic oxides react with water to produce acids.

Aluminum is an amphoteric oxide, it reacts with both acids and bases.

Peroxides play an important role in chemical reactions.

He is working part-time.

The sourness of this lemon is very strong.

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

This compound turns red when it oxidizes.

When I look at the graduation album, memories of high school come back to me.