He made a sculpture using iron.

We will conduct a new chemistry experiment tomorrow.

He is an expert in chemistry.

Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.

This roof is made of galvanized iron.

She can play the glockenspiel well.

He scattered caltrops on the ground.

He used a crowbar to remove the rusted bolt.

This scrap iron can be recycled.

This tin toy is old, but it still works.