Question

What is the cation(+), anion(-) and formula for each of the following compounds.
Sulfur Hexafluoride
Lithium nitride
Chromium (III) carbonate
Ammonium acetate
Cobalt (III0 nitrate

Answer 1

SF6 -> (S 6+) and 6x (F -)
Li3N -> 3x (Li +) and (N 3-)
Cr2(CO3)3 -> 2x (Cr 3+) and 3x (CO3 2-)
NH4COOCH3 -> (NH4 +) and (CH3COO -)
Co(NO3)3 -> (Co 3+) and 3x (NO3 -)

Answer 2

@snuggles7 why don't you explain to them rather than provide direct answers. That way, you promote learning instead of cheating.

Answer 3

I'd always prefer direct answers over annoyingly long ones that force me to think when I'm obviously searching for a direct answe on the internet, since thinking didn't help... but, well


sulfur hexafluoride has 6 fluoride anions (hexa means 6 in greek)
that means there are 6 F- anions which are bound to one sulfur kation
since sulfur has 6 valence electrons it has to give all of them to one fluoride anion respectively (like a mobbing situation, if you ask me.. poor sulfur >.> )

so sulfur is 6+ since it gives away its electrons to 6 fluoride 1- anions

lithium is always 1+ & "nitride" is the name of a nitrogen anion that accepts 3 electrons
that means you need 3 lithium 1+ for 1 nitride 3-

chromium(III) has is charged 3+ cuz its oxidatioin value is +III (that's what the III in chromium(III) means) )
caronate is always CO3 2- (three oxygens take 6 electrons from carbon which only has 4, so it's 2- as a whole ion)
if you want to balance that you need 2x Cr 3+ and 3x CO3 2- to get 6+ -6, got it?

ammonium is NH4+ (it's an ammonia with an extra hydrogen, hence the positive charge, its the conjugate acid of NH3)
so you take one NH4+ to make a neutral bond with the acetate anion (the conjugate base of acetic acid)
this salt results from the acid-base reaction NH3 + HAc --> NH4+ Ac- (Ac for acetate)

and finally cobalt, which has multiple oxidations values but in this case it's +III, since you have Cobalt(III)Nitrate
to neutralize three positive charges you will need 3 NO3 - anions, hence Co(NO3)3
NO3- is the acid residue anion from HNO3 )

do you like it more that way?

Answer 4

@snuggles7 Thank you. very helpful. :)

Answer 5

Well, technically the given answer for sulfurhexafluoride is not correct. It's a gas (covalent compound) and not an ionic compound.

Answer 6

the gaseous state of mater has nothing to do with the type of bonding, flopper

Answer 7

How can you to handle a career if you can't learn to think critically? You won't always have direct answers available to you. Especially if you plan on continuing to higher education and graduate level course work.

Answer 8

Aaronq, not directly no. But it is a nice predictor. Ionic states come with huge bonding energies and thus high melting and boiling points. SF6 is simply not an ionic compound. Its molecular in nature.