This chemical reacts when heat is added.

This chemical reaction is very dangerous.

He is an expert in chemistry.

He called me back immediately after he hung up the phone.

He climbed the wall using a hook.

The couple that argues a lot were again loudly arguing in the park.

He is a famous person for being a no-bariken.

His single word triggered a chain reaction, and everything changed.

She overreacted to his words.

Nuclear reactions are used for mass production of energy.