J. Muench CHEM 120 Name: _____________________ WORKSHEET #3 Due: ______________________ 1. Predict the charges for an element in: a. group 2A b. group 7A c. group 1A d. group 6A 2. Using electron dot symbols, show the electron transfer process in making each of the ionic compounds. a. Li2S b. AlF3 3. Provide names for each of the following ionic compounds. Remember to determine whether or not the metal has a FIXED or VARIABLE charge. a. NaBr e. CaCl2 b. Al2S3 f. FeCl3 c. Cr2O3 g. V2O5 d. PbBr2 h. NiS 4. Given the name, write the correct formula. Remember that an ionic compound must be written so that the net charge between the cation(s) and anion(s) is zero. a. potassium sulfide c. lithium nitride b. aluminum chloride d. silver oxide e. lead(II) bromide g. manganese(II) fluoride f. iron(III) sulfide h. magnesium phosphideJ. Muench 5. Name the following IONIC compounds that contain polyatomic ions. The metals may have a FIXED or VARIABLE charge. a. Al(NO3)3 e. KHCO3 b. Mn3(PO4)2 f. Fe2(CO3)3 c. CuSO4 g. LiMnO4 d. NH4Cl h. SrCrO4 6. Name the following COVALENT compounds. a. PCl3 d. IBr5 b. SF4 e. CO c. N2O4 f. Cl2O 7. Write the correct formula for each of the following. These can be either IONIC or COVALENT compounds and could also include polyatomic ions. a. aluminum bromide e. chromium(III) nitrate b. zinc bicarbonate f. phosphorus pentachloride c. nitrogen trifluoride g. barium carbonate d. sulfur trioxide h. nickel(II) phosphate 8. Predict the type of bond (ionic, polar covalent, or nonpolar covalent) for each. a. Br and Br b. Mg and Br c. S and OJ. Muench 9. Complete the Lewis Dot structures for each of the following covalent compounds. Hint: The last two will require multiple bonds. a. PF3 b. SiCl4 c. SF2 e. SiO2 f. HCN 10. What are the Molecular Geometries of each of the above molecules? Are they polar or non-polar? Molecule PF3 SiCl4 SF2 SiO2 HCN Molecular Geometry Polar or