Synthesis or a combination reaction. Two of the reactants form one final product in the end.
The 1000 to I think that maybe
Ionic compounds are composed of a non-metal as the anion and a metal as the cation. Covalent compounds on the other hand are composed of both non-metals from both charges. In this case, OF2 is covalent, PBr3 is covalent, SeO2 is ionic, C5H12 is covalent, and CBr4 is covalent.
High pressure occur where air sinks.
Creates dry and hot conditions