Minds On…• List the following compounds in order from LOWEST boiling

point to HIGHEST boiling point.Methanol (CH3OH) Propane (C3H8) Pentane

(C5H12)

• Give reasons for your choice

Nomenclature: Part II

LG: I can name and write formulas for multivalents, polyatomics and hydrates

Multivalents: Classical Naming• In the classical system, multivalent are named by

adding different suffixes to the Latin name of an element– “-ic” indicates the higher charge– “-ous” indicates the lower charge

• Latin Names:– Iron: Ferric (3+) Ferrous (2+)– Copper: Cupric (2+) Cuprous (1+)– Tin: Stannic (4+) Stannous (2+)– Lead: Plumbic (4+) Plumbous (2+)

Practice• Name each of the following with the IUPAC

name and Classical nameFeCl2

PbOSnS2

CuF2

Polyatomic CompoundsNaming Rules

– Name the cation first– Name the anion

second– Example: Mg(OH)2

Formulas for compounds– Use “Teeter-Totter” to

balance +ve and –ve charges– Example: Lead (IV) Sulfate

Oxyanions• Oxyanions are polyatomic compounds that

contain oxygen (ie. NO3-, SO3

2-)– Number of oxygens determines prefix and suffix of

ion name– Example:

Hydrates• A hydrate is a compound that contains water

molecules within its crystal structure.

• When heat is applied, hydrates will decompose to produce water vapour and an ionic compound

CuSO45 H2O CuSO4 + 5 H2O

• When the water is removed, the remaining ionic compound is referred to as anhydrous.

Naming Hydrates• The IUPAC name for hydrates uses Greek

prefixes to indicate the number of water molecules.

CuSO45 H2O = Copper (II) Sulfate Pentahydrate

Homework

• Old Text: Pg 96-97 # 16-21