Ionic Compounds Binary compounds: compounds composed of two elements Binary Ionic Compounds Made up of what types of elements? Ex. KCl Contains: potassium cations (K+) chloride anions (Cl-)

Ionic Compounds Ex. Calcium bromide Contains: Ca 2+ Br - Formula= CaBr 2

Ionic Compounds Ex. Rust: Iron (III) oxide writing the formula: Fe 3+ O 2- Balance the charges (basically switch charges) Fe 2 O 3 find the least common multiple of the charges: 3*2 =6, two Fe 3+ cations (6+ charge) will balance the O 2- anions (6- charge) Formulas for ionic compounds always show the lowest whole-number ratio of the ions

Ionic Compounds Ex. Calcium sulfide Ca 2+ S 2- CaS Ex. Barium chloride Ba 2+ Cl - BaCl 2

Review Write formulas for the following binary ionic compounds -Copper (II) sulfide Cu 2+ & S 2- Switch charges; put them in the lowest common multiple CuS Potassium nitride K + and N 3- Switch charges; put them in the lowest common multiple K 3 N

Naming Binary Ionic Compounds (going backwards) CuO Copper oxide There are two forms of copper, how do you know which form, Cu + or Cu 2+ ? CuO 1:1 ratio What is the charge on the oxide ion? (2-) In order for there to be a 1:1 ratio, there must be a 2+ charge on the copper, making it Copper (II) oxide

Naming Binary Ionic Compounds SnO Tin oxide There are two forms of tin, Sn 2+ & Sn 4+, since 1:1 ratio, must be Sn 2+, making it Tin (II) oxide

Review CoI 2 Cobalt iodine Ans. Cobalt (II) iodide Cs 2 O Cesium oxygen Ans. Cesium oxide

Ternary Ionic Compounds Ternary Ionic Compounds: compounds that contain atoms of three different elements Calcium Nitrate Ca 2+ NO 3 - Switch charges; put them in the lowest common multiple Ca(NO 3 ) 2 parentheses indicates that there are two nitrate ions needed

Ternary Ionic Compounds Lithium carbonate Li + CO 3 2- Switch charges; put them in the lowest common multiple Li 2 CO 3

Review Potassium sulfate K + SO 4 2- K 2 SO 4 Magnesium hydroxide Mg 2+ OH - Mg(OH) 2

Naming ternary compounds, same as binary K 2 Cr 2 O 7 : consists of two K + ions and one Cr 2 O 7 2- Potassium dichromate

Review Name the following compounds LiCN Lithium cyanide Sr(H 2 PO 4 ) 2 strontium dihydrogen phosphate

Review (NH 4 ) 2 C 2 O 4 ammonium oxalate Fe(ClO 3 ) 3 iron (III) chlorate