Electron Dot Structures for molecules??? Chemistry helppp?

Question

i have to do electron dot structures for these molecules.
i think i got the answers to most of them, but im not sure.
it says to include all resonance structures.
can someone explain what that is.

methane CH4.
ethane C2H6
methanol CH4O
ethanol C2H6O
carbonate ion CO3 2-
silicon dioxide SiO2
nitrous oxide N2O
sulfate ion SO4 2-
phosphate ion PO4 3-
sulfur dioxide difluoride SO2F2

obv. you cant type this out..
but does anyone know of a website(s) that would have the answers.
please send all of the links.
first person with all links gets 10pts.

Answer 1

The explanation of the resonance structures:
http://en.wikipedia.org/wiki/Resonance_structures

I the following I just show the bonding electrons. And if I show S->O, that means "S" donates a pair of electrons to "O" for bonding.
Chemicals that do not have resonance structures:
1) methane CH4:
H:(H:)C(:H):H, which is equivalent to H-(H-)C(-H)-H. This means all 4 "H-" bonds to "C".
2) ethane C2H6:
Follow what I did for methane, basically H3C-CH3
3) methanol CH4O:
Basically H3C-O-H
4) ethanol C2H6O:
H3C-C(H2)-O-H
6) silicon dioxide SiO2:
O=Si=O, or O::Si::O
8) sulfate ion SO4 2-
O<-(O<-)S(->O)->O. That means "S(2-) has 8 electrons, and donates 2 to every "O" for bonding.
9) phosphate ion PO4 3-:
O<-(O<-)P(->O)->O.
10) sulfur dioxide difluoride SO2F2:
O<-(O<-)S(-F)-F

Chemicals that have resonance structures:
5) carbonate ion CO3 2-
O=C(->O)->O
O<-C(=O)->O
O<-C)->O)=O
7) nitrous oxide N2O
N≡N->O
(-)N=N(+)=O
where (-) and (+) indicate charge at the atom (closest to the charge sign)

Answer 2

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Any connection between the Lewis structure and the polarity is tenuous, at best. The Lewis structure was never intended to be anywhere close to a physical representation of a molecule. A Lewis structure is a "schematic diagram." The polarity of a molecule actually does depend on the three dimensional shape of the molecule and whether the molecule is symmetrical or not. That being said, there are ways to draw the Lewis structure to suggest the 3-dimensional nature of the molecule and to imply the geometry. But the bottom line is that there need not be a connection between the Lewis structure and the geometry. Consider the Lewis diagrams for BeH2 and H2S: H-Be-H vs H-S-H The both appear linear, but only BeH2 is linear, and therefore, not polar. H2S is bent and polar. You would have to read into the diagram that the two lone pairs on H2S give tetrahedral electron pair geometry resulting in a bent structure. But that really isn't indicated by the Lewis diagram.