Roger Bacon was an English alchemist that may or may not have been the first european to invent gunpowder. Some people think differently, like it was a german guy or the chinese hundreds of years ago.
Alchemists work was mostly try to turn (something) into gold. This was called a "trasmutation" reaction, but it couln't be done with chemical reactions. Althogh, they did discover some chemistry.
The ancient Egyptians, on the other hand, were practical and invented lots of things. They made the first glass, and dyes and medicines.
•The Greeks called this “chemia,” after the Egyptian word “Chem,” which meant "black". "Chem" was the Egyptian name for their own country. Some people thought that "chemia" meant "black magic" because some Egyptian prosesses looked like magic. When the Arabs conquered Egypt, the prefix "al", which meant "the", was added to the word "chemia", so it became "alchemia".
After that, in English it became "alchemy". This name was much better because before, alchemy wasn't considered a real, or important science.