does anyone know how to do this?

1. (6pts) For the following pairs of ions, write the formula of the compound that you would expect them to form: a. magnesium and hydroxide - b. manganese(IV) and oxygen c. cobalt(III) and sulfite 2. ( 6pts) Platinum is a transition metal and forms two different ions, Pt2+ and Pt4+. Write the formulas for the compounds for each platinum ion with: a. fluorine ions b. cyanide ions c. chromate ions 3. (4 pts) Name the following compounds: a. SO3 b. AuBr3 c. Li3PO4 d. TiO2 4. (4 pts) Write the formulas for the following compounds: a. sulfur pentachloride b. nitrogen dioxide c. zinc(II) perchlorate d. barium sulfide