1. Draw the Lewis dot structures for the following ions and molecules:

H₂O NH₃ NH₄⁺

sulfite sulfur trioxide perbromate

xenon tetrafluoride carbon dioxide NH₂(CH₂)₄COOH

C₆H₁₂ (cyclic) C₆H₄Cl₂ (cyclic) - I don’t care where the Cl’s go

2. Does resonance change the formal charge on atoms in a structure? Support your answer.

3. Draw the Lewis dot structure for NO₂ and the dimer N₂O₄. Why is the dimer form more stable? (BTW, a dimer is a molecule formed from the combination of two other identical molecules.)

4. Describe (not just label) all of the bonding in barium sulfate. Your answer should include any appropriate LDS.