Naming Chemical Compounds Worksheet With Answer Key - Germanna Community College Page 3
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1
2
3
4
5
6
7
8
9because the charge on bromine is -1. Thus the formula is MgBr
.
2
(Remember, subscripts of 1 are not written). Likewise, given the
name Iron (III) oxide, we can determine that the iron will have a
subscript of 2, because the charge on oxygen ion is -2; the oxygen
will have a subscript of 3, because we have been told we are dealing
with iron with a charge of 3. So the formula is Fe
O
. The only time
2
3
this rule is not true is when the charges on the ions are equal- for
example, when oxygen, with a charge of -2, bonds with magnesium,
which has a charge of +2. In this case, the charge on one oxygen ion
is equal to the charge on one magnesium ion, so it will only take one
oxygen ion and one magnesium ion to form a compound that has no
charge. Thus, this compound has the formula MgO, not Mg
O
. The
2
2
same thing happens when calcium and oxygen combine. Calcium has
a charge of +2, and oxygen has a charge of -2. Because their charges
are equal, it only takes one of each to form a compound with no
charge, so the formula is CaO, not Ca
O
.
2
2
Part Two: Naming Binary Molecular Compounds
Identifying Binary Molecular Compounds
Molecular compounds consist of combinations of non-metals. Binary molecular compounds
are composed of only two elements. They are easy to identify, as they consist merely of two
non-metal elements. Examples: H
O (water), NF
, and N
O
.
2
3
2
4
Naming Binary Molecular Compounds
There are four steps to name binary molecular compounds:
1. The name of the element farthest to the left in the periodic table is written
first.
i.
There are occasional exceptions to this rule. The main exception is
oxygen. Oxygen, except when combined with fluorine, is always
written last.
2. If both elements are in the same group in the table, the lower one is
written first
-ide
3. The name of the second element is given an
ending.
4. Greek prefixes are used to indicate the number of atoms of each element.
i.
The prefixes are as follows:
Mono-= one
Hepta-= seven
Di-= two
Octa-= eight
Tri-= three
Nona-= nine
Tetra-= four
Deca-= ten
Penta-= five
Hexa-= six
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3
Naming Compounds
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