Old Church Slavonic is the first language written by the Slavs.

The study of organic compounds is an important field in chemistry.

This inorganic compound plays an important role in chemical reactions.

Sandwich compounds are being studied in a branch of chemistry.

He always buys cheap things, so in the end, it becomes 'penny wise and pound foolish'.

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.

In this chemistry experiment, we will learn about the dangers of cyanide compounds.

I will participate in an obstacle race this weekend.