Language Of Chemistry Worksheet With Answer Key Page 3
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1
2
3
4
5What is the name for K
SO
? Potassium sulfate (keep the polyatomic name as is)
2
4
Copper(I) chloride cause Cl is –1 so Cu must be +1
What is the name for CuCl?
is –3 so Fe must be +3
What is the name for FePO
? Iron(III) phosphate cause PO
4
4
Name for Ca(NO
)
? Calcium nitrate
3
2
Name for Na
O? Sodium oxide
2
Given the name of a compound, predict the formula:
You must know charges on ions formed by Group A main elements.
Know how to use polyatomic ions given on your Periodic Table!
S since Li is +1 and S is –2 you need two Li’s
Lithium sulfide is Li
2
Calcium oxide is CaO since Ca is +2 and O is –2 you just need one of each
since Fe is +2 and Br is –1 you need two Br’s
Iron(II) bromide is FeBr
2
since K is +1 and acetate is –1, need one of each
Potassium acetate is KC
H
O
2
3
2
is –1, need two nitrites
Gold(II) nitrite is Au(NO
)
since Au is +2 and NO
2
2
2
Sodium iodide is NaI since Na is +1 and I is –1, just need one of each
7.7
BINARY MOLECULAR / Covalent COMPOUNDS
Molecular Compounds: compounds consisting of 2 nonmetals. These are NOT ions, so no
charges. You are not trying to add up to zero charge with these.
# of atoms of element indicated by Greek prefix before element name
nd
prefix except mono + nonmetal name + prefix + 2
nonmetal name + ide
# of atoms
Greek prefix
# of atoms
Greek prefix
1
mono
6
hexa
2
di
7
hepta
3
tri
8
octa
4
tetra
9
nona
5
penta
10
deca
CO
= carbon dioxide
2
PCl
= phosphorus trichloride
3
N
S
= dinitrogen pentasulfide
2
5
SF
= sulfur hexafluoride
6
Cl
O
= dichlorine heptaoxide
2
7
Reminders: Prefixes are ONLY used with molecular compounds. Roman numerals are
ONLY used with variable charged metal ionic compounds. Polyatomic ions never
change their name.
CHM 130: Chapter 7
page 3 of
5
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