Now what was the correct ingredient sodium chloride or sodium
cyanide ? Oh well, what is in a name anywayHaHa..Ha
Thought Map for Nomenclature
Metallic Politics Zachmann refers to the alkaline metals and the
alkaline earth metals as conservatives. The term is used to remind
the students that these metals tend to show only one valence
destiny. The transition metals can use the d-orbitals to expand the
valence shell. Since they can have many possible valences they are
called liberals. The main point to keep in mind is that when a
transition metal is in the compound then the name must include the
exact valence of the metal in the name.
Name CaCl2Following the protocol for naming we ask what kind of
compound is this?Since it is a binary compound we must then ask
what kind of binary compound is it?Since it is a metal-nonmetal
binary we must ask do I need to include the valence of the
metal?Since calcium is a conservative metal we do not need to
include the valence of the metal in the name. Therefore the name is
calcium chloride.
Name Cu2OFollowing the protocol for naming we ask what kind of
compound is this?Since it is a binary compound we must then ask
what kind of binary compound is it?Since it is a metal-nonmetal
binary we must ask do I need to include the valence of the
metal?Since copper is liberal metal we do need to include the
valence of the metal in the name. We must then ask what is the
valence of this metal.By the reverse crisscross method and
validation of the nonmetal valence we find the valence of Cu to be
1.Therefore the name is copper I oxide.
Name CuOFollowing the protocol for naming we ask what kind of
compound is this?Since it is a binary compound we must then ask
what kind of binary compound is it?Since it is a metal-nonmetal
binary we must ask do I need to include the valence of the
metal?Since copper is liberal metal we do need to include the
valence of the metal in the name. We must then ask what is the
valence of this metal.By the reverse crisscross method and
validation of the nonmetal valence we find the valence of Cu to be
2.Therefore the name is copper II oxide.
Name N2O5Following the protocol for naming we ask what kind of
compound is this?Since it is a binary compound we must then ask
what kind of binary compound is it?Since it is a nonmetal-nonmetal
binary we can name the compound by simply identifying the frequency
of each atom with a prefix.Since nitrogen appears two times and
oxygen appears five times we use the respective prefixes di and
penta.Therefore the name is dinitrogen pentoxide.
Name Fe3(PO4)2Following the protocol for naming we ask what kind
of compound is this?Since it is a ternary compound we must approach
it like a ionic binary compound. Since it has a metal component we
must ask do I need to include the valence of the metal?Since iron
is liberal metal we do need to include the valence of the metal in
the name. We must then ask what is the valence of this metal.By the
reverse crisscross method and validation of the nonmetal valence we
find the valence of Fe to be 2.Therefore the name is iron II
phosphate.
Finding Valence from a FormulaAs instructed in class we simply
reverse the crisscross. With this method the subscript of the
neighboring element (or polyatomic ion) becomes the probable
valence. To be sure you must always validate the probable valence
of the nonmetal component. To do this just form a ratio with the
probable valence as the denominator and the valence destiny value
as the numerator. Now, set this ratio equal to the comparable ratio
for the metal component and solve for the unknown numerator value
for the metal.
Find Valence of Cu and O in CuOThe subscripts are both 1.By
reverse crisscross we get a probable valence of 1 for oxygen and a
probable valence of 1 for Cu.Now the valence destiny of oxygen
according to ASIMS is 2 thus our equation becomes:(X)/1 = 2/1 and
solving for x we get 2.
Ok, now that you are all charged up dont let the cat get your
tongue, name this compound!... SO3Yes, it is sulfur trioxide. The
valences of S and O are 6 and 2 respectively.
Find Valence of C and O in CO2The subscripts C and O are 1 and 2
respectively.By reverse crisscross we get a probable valence of 1
for oxygen and a probable valence of 2 for C.Now the valence
destiny of oxygen according to ASIMS is 2 thus our equation
becomes:(X)/2 = 2/1 and solving for x we get 4.The valence of
carbon is 4 and that of oxygen is 2.
Reminders for the QuizFrom the homework problems and this
reminder review you now know the exact skills that the quiz and or
exam will assess.Given a formula be able to name it.Given a name be
able to write the formula for the name.Given a formula be able to
determine the valence of each component by the method of reverse
crisscross/validation.
