The atom theory has been around since the 19th centry
Answer:
1. C(2)+H2(1) -> C2H6(1)
2. NH3(2)+O2(3)-> HCN(2)+H2O(3)
I am not sure about the second one.
Answer:
Nitrates are oxidising agents
Calcium fluoride: CaF₂
Ca(2+) >>> Ar (argon)
F(-) >>> Ne (neon)
That would be <span>Johannes Gutenberg a German inventor from the 1400's </span>