Yes it had been made. An example: In the process of cracking the polymeric chains.
Yes
Gottelieb made an engine that ran on petrol.
Unleaded petrol is petrol that has not been treated with a lead compound.
A hypothesis
Petrol is somewhat man made. Oil is a natural resource but it must be refined in order to make gas or petrol from it.
petrol is extracted from crude oil
Black holes (in the astronomical sense) have never been made in the laboratory.
what are the laboratory apparatus that are made up of ceramics
The metal that is commonly used in a petrol engine is mainly made of aluminum. Some are also made of cast iron.
petrol is made from the fossil fuel oil
How many radioactive elements are made only in a laboratory?
oil