Classify each of the substance as an atomic element, molecular element, molecular compound or ionic compound N2O Fluorine K2O Silver Fe2O3

Naming of Ionic Compounds Common names Systematic names – can be determined from its chemical formula Ionic compounds Metals form only one type of Ion Metals form more than one type of Ion

Metals form only one type of cation

Metals that form more than one cation Metals of this type are mainly the transition elements Example : Iron forms +2 cation in some compounds and +3 in others Exception : Zn and Ag forms ions that cannot be inferred from their group number Some main group elements form more than one cation Example: Pb and Sn

Naming Binary Ionic Compound Binary compound contains two different elements KCl , CaO Base name of Anion(non-metal) + - ide Name of Cation

Some common monoatomic anions

Practice Name the compound CaBr2 Name the Compound Ag3N Write the formula for Rubidium Sulfide

Naming Binary Ionic Compounds Containing a Metal That Forms more than one type of Cations For these type of Metals, the name of the cation followed by a roman numeral (in parenthesis) that indicates the charge of the metal in that particular compound.

Some Metals That Forms Cations With Different Charges

Their names have the form Name of Cation(metal) Charge of cation in Roman numerals in paranthesis Base name of anion(non metal) + -ide

Practice CrBr3 CuO PbCl4 FeS Write the formula for Ruthenium (IV)Oxide

Naming Ionic Compounds Containing Polyatomic ions Follow the same way as other ionic compounds We us the name of the polyatomic ion whenever it occurs Most of the polyatomic ions are oxyanions, anions containing oxygen and other element NaNo2 FeSO4 NH4NO3

Naming Ionic Compounds Containing Polyatomic ions If there are two ions in the series one with more oxygen atom has an ending -ate and the one with fewer has an ending -ite Example : No2- - Nitrite NO3- - Nitrate

Naming Ionic Compounds Containing Polyatomic ions If there are more than two ions in the series then the prefixes Hypo – less than Per – more than Example : ClO- - Hypochlorite ClO2- - Chlorite ClO3- - Chlorate ClO4- - Perchlorate

Practice Name the compound Li2Cr2O7 Name the compound Sn(ClO3)2 Write the formula for Cobalt(II) phosphate Cobalt (II) means an ion Co 2+ Phosphate means an ion PO4 3- As the compound needs to be electrically neutral, there must be 3 Cobalt (II) ions, and 2 phosphate ions. So the formula is Co3(PO4)2

Hydrated Ionic Compounds Hydrates – Contain specific number of water molecules associated with each formula unit Example : Epsom salt The formula for Epsom salt is MgSO4·7H2O Systematic name is magnesium sulfate heptahydrate . The seven water molecule associated with the formula unit is called waters of hydration Waters of hydration can be easily removed by heating the substance

Examples Cobalt(II) chloride hexahydrate is pink and when its heated it forms anhydrous cobalt chloride which is blue in color Common hydrated ionic compounds and their names CaSO4·1/2H2O – Calcium sulfate hemihydrate BaCl2·6H2O - Barium Chloride hexahydrate CuSO4·5H2O - Copper(II) sulfate pentahydrate

Name these Hydrates A) MgCO3  5 H2O B) CuI2  2 H2O C) Cr(NO3)3• 7 H2O D) BaCl2• 2 H2O

Write the formula for the following Magnesium Sulfate hexahydrate Sodium Carbonate decahydrate Lithium Nitrate trihydrate Calcium Sulfate hexahydrate Cesium Carbonate dihydrate