NOTE: If you are determining the chemical formula, please write down the symbol(s) and charge of the cation and anion before writing the correct chemical formula.
1. Hexanitrogen tetrachloride
2. Pb1(C1O3)1
3. Sulfurous acid
4. N1O1
5. Tin (IV) sulfite
6. Cu2(Cr2O7)1
7. H1Cl1O3 {or as I have been using but is wrong, H1(Cl1O3)1}