Ionic or covalent?

Question

For each of the following:
H2O
HCI
NaCl
H2O
CuSO4
CHO
Why?

Answer 1

H2O - covalent
HCL - covalent if gaseous, ionic in solution
NaCL - ionic
H2O - still covalent, just like it was at the top of the list
CuSO4 - ionic
CHO - covalent

Ionic => electrons are completely separated from one party and attached to the other. Covalent => electrons are shared.

The only tricky one here is HCl, which forms a covalent bond in pure form (usually as a gas), but separates into ions in aqueous solution. Since we normally have it in solution, if you need a single answer and no further details are given, put down ionic.

Answer 2

Most inter atomic bonds are a mixture of Ionic and covalent. The extent to which they are one or the other depends on the relative valency of the atoms involved.

Answer 3

H2O covalent (mostly)
HCl covalent (in the gas phase)
NaCl ionic
H2O (ha! thought you'd catch me!)
CuSO4 ionic
CHO covalent (I guess you're asking for a generic carbohydrate or for CH2O, formaldehyde: The answer is the same.)

Answer 4

umm..
for this..
u have to check the electro negativity chart if u have one
it should be on periodic table

basically u subtract the eletro negatively between the bonds
lets say..
h20?
oxygen is bonded to 2 hydro gens so u subtract the electronegatively from the oxygen and the hydro(its higer -lower)
and if the value is greater then 1.7 its ionic
anything esle is covanlent

Answer 5

Ionic=HCI,NaCl,CuSO4(B/c they are combination of metal and non metal elements)
Covalent=H2O,CHO(b/c they involve all non metals elements)

I hope this helps!!