Mixed
Compounds
For the upcoming test, you are expected to
be able to write formulas and names of
compounds. After this test, you will begin
to work problems in which only the name
of the compound (not the formula) is
provided. Partial credit will not be given
for incorrect formulas!
The following checklist can help you to
differentiate between the types of
compounds.
1. Is the compound an acid?
Yes or No
1. Is the compound an acid?
If the answer is yes, then ask:
Does it contain oxygen?
Yes or No
Yes:
-ate-ic
-ite-ous
No:
acid
hydro- -ic acid
1. Is the compound an acid?
If the answer is No, then go on to #2.
2. Count the number of
elements present.
2. Count the number of
elements present.
If the answer is 3 or more, then
identify the polyatomic ion
present and determine if a
Roman numeral is necessary.
***Remember, a Roman numeral is
necessary for compounds when:
the first element is on the left side of
the stair-step line but is NOT in
Group 1, Group 2,
or the diagonal (Al, Zn, Ag)
2. Count the number of
elements present.
If the answer is 2, the find the
location of both of the elements
on the periodic table.
2. Count the number of
elements present.
a. If both elements are on the right
side of the stair-step line, then use
prefixes to name the compound.
2. Count the number of
elements present.
b. If there is an element on either side
of the stair-step line, then determine if
a Roman numeral is necessary.
Example 1: CuI
1. Is the compound an acid? No
2. Count the number of elements present. 2
*Where are the elements? Both sides of SSL
*Does it need a Roman numeral? Yes
+1 1
CuI
LCM
+1 1
copper (I) iodide
Example 2: CuI2
1. Is the compound an acid? No
2. Count the number of elements present. 2
*Where are the elements? Both sides of SSL
*Does it need a Roman numeral? Yes
+2 1
LCM
CuI2
+2 2
copper (II) iodide
Example 3: CoI2
1. Is the compound an acid? No
2. Count the number of elements present. 2
*Where are the elements? Both sides of SSL
*Does it need a Roman numeral? Yes
+2 1
LCM
CoI2
+2 2
cobalt (II) iodide
Example 4: Na2CO3
1. Is the compound an acid? No
2. Count the number of elements present. 3
*What is the polyatomic ion? carbonate
*Does it need a Roman numeral? No
sodium carbonate
Example 5: NaHCO3
1. Is the compound an acid? No
2. Count the number of elements present. 4
*What is the polyatomic ion? hydrogen carbonate
*Does it need a Roman numeral? No
sodium hydrogen carbonate
Example 6: Ru2(SO4)3
1. Is the compound an acid? No
2. Count the number of elements present. 3
* What is the polyatomic ion?
sulfate
*Does it need a Roman numeral? Yes
+3
LCM
2
Ru2(SO4)3
+6
6
ruthenium (III) sulfate
Example 7: NaFO
1. Is the compound an acid? No
2. Count the number of elements present. 3
*What is the polyatomic ion? hypofluorite
*Does it need a Roman numeral? No
sodium hypofluorite
Example 8: BaCrO4
1. Is the compound an acid? No
2. Count the number of elements present. 3
*What is the polyatomic ion? chromate
*Does it need a Roman numeral? No
barium chromate
Example 9: H2C2O4
1. Is the compound an acid? Yes
Yes
2. Does it contain oxygen?
*What is the anion name?
*Use “–ate –ic, -ite –ous” acid.
oxalic acid
oxalate
Example 10: H3P
1. Is the compound an acid? Yes
No
2. Does it contain oxygen?
*What is the anion name?
*Use hydro- -ic acid.
phosphide
hydrophosphoric acid
Example 11: SCl6
1. Is the compound an acid? No
2. Count the number of elements present. 2
*Where are the elements? Right side of SSL
*Use prefixes.
sulfur hexachloride
Example 12: Rb3N
1. Is the compound an acid? No
2. Count the number of elements present. 2
*Where are the elements? Both sides of SSL
*Does it need a Roman numeral? No
rubidium nitride
You need to work and re-work
problems for extra practice.