Name_____________________________________________________Date_______________Per_____
Covalent Bonding
1. Which of these molecules has a Lewis structure with a central atom having no nonbonding
electron pairs CO2, H2S, PF3, SiF4 (there may be more than one that fits this description)?
2. Draw the Lewis structure for CH2Cl2.
3. Draw the Lewis structure for HCN
4. Draw the Lewis structure for ClO25. Draw the Lewis structure for PO4-3
6. Phosphorus oxychloride has the chemical formula POCl3, with P as the central atom. To
minimize formal charge, how many bonds does phosphorus make to the other atoms in the
molecule (count each single bond as one, double bond as two, etc.)?
7. The cyanate ion NCO- has three possible Lewis structures. Draw the three possible structures
and assign formal charges in each. Which Lewis structure is dominant?
8. Determine the empirical formula of a compound containing 75.0% carbon and 25% hydrogen.
9. Calculate the empirical formula of a compound containing 81.8% Carbon and 18.2% hydrogen.
10. Find the molecular formula for a compound whose molar mass is 124.06g/mol and empirical
formula is CH2O3.
11. Determine the molecular formula of a compound with the empirical formula NO2 and a
molecular weight of 46g.
12. Determine the molecular formula of a compound with the empirical formula CH2O and a
molecular weight of 180g.