How can I tell if a compound is molecular or ionic?

Question

With these compounds:

a) B2H6 b) CH3OH c) LiNO3 d) Sc2O3 e) CsBr f) NOCl g) NF3 h) Ag2SO4

Answer 1

Molecular cpds - composed entirely on nonmetals

Ionic contains a metal/ammonium ion and anion(s)

M = molecular

I = ionic

a) B2H6 - I

b) CH3OH - M

c) LiNO3 - I

d) Sc2O3 - I

e) CsBr -I

f) NOCl -M

g) NF3 - M

h) Ag2SO4 - I  

Answer 2

a molecular compound is formed between 2 non-metals.  an ionic compound is formed between a metal and a non-metal.

since boron and hydrogen are non-metals, a) is molecular

b) molecular

c) ionic.  lithium has to form an ion to bond with the nitrate ion.

d) ionic

e) ionic

f) molecular

g) molecular

h) silver has to form an ion to bond with the sulfate ion.  (go burn cream!)