Living By Chemistry SECOND EDITION Unit 1: ALCHEMY Matter, Atomic Structure, and Bonding

Lesson 23: Alchemy of Paint Transition Metal Chemistry

Key Question What types of compounds are made from transition metals?

You will be able to: recognize transition metal compounds and their names determine the charge on transition metal ions given their chemical formula

Discussion Notes Many of the paint pigments that artists historically used and continue to use are ionic metal-nonmetal compounds. (We will not be doing this lab due to the toxicity of working with heavy metals)

Transition Metal Ion names/formulas Transition metals can have multiple types of ions. They’re still cations, though. Naming transition metal compounds have a special designation—use of Roman Numerals to indicate the charge of the metal Examples: Lead (IV) Oxide would be PbO2 Iron (III) Oxide would be Fe2O3

From formula to name What would be the name for CoO? First, start with your known ion--oxygen oxygen’s ionic symbol is O-2 if oxygen is -2, then cobalt must be +2 Name: Cobalt (II) Oxide

From formula to name What is the ionic compound name for Cu2O3? Oxygen’s charge 3(-2) = -6 Therefore: Copper’s charge is +6/2 = +3 Name: Copper (III) Oxide

From formula to name Now You Try Given: What would be the name for FeCl3? Start with your known ion, Chlorine… Cl has a -1 charge. Since there’s 3 Chlorines, 3(-1) = -3 Therefore, iron must be +3 Name: Iron (III) Chloride