Draw lewis structure of CH3CO 2-

Question

karisleft · Answer

Im getting this but its saying im wrong? please help

karisleft · Answer

@sweetburger Need your help mad chemist haha

karisleft · Answer

or you @greatlife44 mister walking periodic table

karisleft · Answer

@inkyvoyd @zepdrix i heard you two were both good at chemistry as well!

ilovepuppieslol · Answer

sean help her @sweetburger

sweetburger · Answer

is it CH3CO2 - or CH3CO 2-

ilovepuppieslol · Answer

acetate ion?

ilovepuppieslol · Answer

is the red part where u got wrong/?? @KarisLeft

sweetburger · Answer

yea assuming its C2H3O2^- that is the acetate ion

karisleft · Answer

attachment

karisleft · Answer

yes acetate ion

sweetburger · Answer

well your lewis structure is correct. maybe its an issue with the program you are using

ilovepuppieslol · Answer

is the red part where u got it wrong??

sweetburger · Answer

seems unlikely both oxygens have correct formal charges of 0 and -1

karisleft · Answer

@ILovePuppiesLol i think so, and @sweetburger hmm maybe.... this is frustrating haha

karisleft · Answer

is the same thing happening with this one? or does the -2 go into effect somewhere?

sweetburger · Answer

unless the program is looking for this 
|dw:1481091691435:dw|
maybe it wants you to include resonance structures?

karisleft · Answer

ahh it does, let me try!

karisleft · Answer

wait whats the difference between that one and my answer? or does that not include resonance structures

sweetburger · Answer

Resonance structures are every possible lewis diagram for a molecule. There are more than just one.

sweetburger · Answer

Ok for IBr3 you wont have any double bonds between I and Br.
You should have single bonds between each I and Br with 2lone pair groups on the central Iodine. This will result in a formal charge of 0 on each respective element.

karisleft · Answer

It says this on it when i get it wrong, meaning i guess i need to show another possible structure

sweetburger · Answer

how many structures did you show?

karisleft · Answer

just the picture of what i have

sweetburger · Answer

yea you need to include both of the structures

karisleft · Answer

and for the ibr3 2-, this is what i have so far

karisleft · Answer

what would the other structure look like?

sweetburger · Answer

|dw:1481092217693:dw| this

ilovepuppieslol · Answer

@Jamierox4ev3r

sweetburger · Answer

i explained how to draw IBr3 above

sweetburger · Answer

you need to have a formal charge of 0 on the central Iodine. With your current structure that is not the case.