Answer:
I think the answer is D. Temperature affects only the rate of reaction.
Answer:
RbF
mgo
nh4cl
because electrons are lost by and element forming a cation and gained by the other element forming an anion and held together by electrostatic forces
True will end up being the answer
mass (m) = ? , volume = 18.0 ml , density = 1.42 g/ml .

I hope I helped you^_^