He ate one apple.

This inorganic compound plays an important role in chemical reactions.

Sandwich compounds are being studied in a branch of chemistry.

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

If the level of urate is high, the risk of gout increases.

The sourness of this lemon is very strong.

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

These two elements chemically combine to create a new substance.

My grandfather used to plow the rice fields with a horse in the old days.

In this ancient document, the word 'urine' is used.