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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