What is it called when a object changes to a different state of matter, physical or chemical change

Two things that biomedical has invented or innovated

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's