Binary Molecular Compounds
Binary Molecular Compounds
• Binary molecular compounds are
composed of two different nonmetals
– examples: CO, SO2, N2H4, P4Cl10
• These compounds are named by using a
prefix to indicate the number of atoms of
each element present (see table in
notebook ).
H2O
• Dihydrogen Monoxide
• The prefix mono- is often
omitted especially when
the first element would
have the prefix monoCO
• (example: CO is named
carbon monoxide, not
monocarbon monoxide).
Name the following compounds:
NF3
N2O4 P4S10
• NF3 is nitrogen trifluoride
• N2O4 is dinitrogen tetroxide
(Note: dropped an 'a')
• P4S10 is tetraphosphorous
decasulfide
Write formulas for the following compounds:
• dichlorine heptaoxide
• carbon hexasulfide
• octaphosphorous pentaoxide
• dichlorine heptaoxide is
Cl2O7
• carbon hexasulfide is
CS6
• octaphosphorous
pentaoxide is P8O5
Acids
Acids
• Acids are compounds that give off hydrogen
ions, (H+) when dissolved in water. When a
compound has hydrogen as its cation the
substance is generally an acid
– Examples: HCl, H2SO4, H3PO3
• The rules for naming acids are based on the
anion portion of the acid formula.
Rules for Naming Acids
• The names of acids are based on the
ending of the anion name.
– Examples: HCl, H2SO4, H3PO3
Rules for Naming Acids
• The names of acids are based on the
ending of the anion name.
– Examples: HCl, H2SO4, H3PO3
• Cl‾ = chloride
Rules for Naming Acids
• The names of acids are based on the
ending of the anion name.
– Examples: HCl, H2SO4, H3PO3
• Cl‾ = chloride
• SO42‾ = sulfate
Rules for Naming Acids
• The names of acids are based on the
ending of the anion name.
– Examples: HCl, H2SO4, H3PO3
• Cl‾ = chloride
• SO42‾ = sulfate
• PO33‾ = phophite
Rules for Naming Acids
Anion ending
Example
Acid name
Example
-ide
Cl- (chloride)
hydro-(stem)-ic acid
hydrochloric acid
-ate
SO42- (sulfate)
(stem)-ic acid
sulfuric acid
-ite
PO33- (phosphite)
(stem)-ous acid
phosphorous acid
Name the acids
• HNO2 nitrous acid
• HCN hydrocyanic acid
• H3PO4 phosphoric acid
Write formulas for the following acids
• chromic acid
H2CrO4
• hydroiodic acid HI
• chlorous acid HClO2
Homework
• Do the 4 “HOMEWORK” (Not example)
problems on the Binary Molecular
Compounds and Acids note page.
– Do these problems on your own paper.
– Homework will be collected tomorrow.