organic chemistry..
A chemist
A Botanist is someone who studies plants.
A zoologist, zoology is the study of animals.
A person who studies oil is called a petrologist or petroleum geologist. They specialize in the exploration, extraction, and production of oil and gas resources.
a diamondologist which is a subset of gemologists (study all precious and semi-precious stones)
I don't know what you call them, but they are studying organic chemistry.
A chemist
The variations of bonding with carbon. The word organic in organic chemistry pretty much mean carbon so you could call it carbon chemistry. Carbon has its own field because it can create insanely many compounds.
You call someone that studies metal a metallurgist.
A person who studies physics is called a physicist, a person who studies chemistry is called a chemist, and a person who studies biology is called a biologist.
A physicist.
a person who studies planets is a planetologist.
There is no special name for someone who studies Hebrew.
florist
An Anthropologist.
Microbiologists
Brocollogist