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'.

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

I will participate in an obstacle race this weekend.

In this situation, the proverb 'it is best to submit to circumstances' applies.

This area is affected by radioactive fallout from past nuclear tests.