Name: _______________________________________Date: ________________
Chemistry
Mr. Herman
Exeter SHS
Chapter 7.1 Chemical Names and Formulas
Beginning on page 227 (Binary Molecular compounds)
Vocabulary
Binary molecular compounds
Chemical formula
Acid
Objectives
• Explain the significance of a chemical formula.
• Using prefixes, name a binary molecular compound from its formula.
• Write the formula of a binary molecular compound given its name.
Significance of a Chemical Formula-covalent
• A chemical formula indicates the relative number of atoms of each kind in a
chemical compound.
• For a molecular compound, the chemical formula reveals the number of atoms of
each element contained in a single molecule of the compound.
• example: octane — C8H18
The subscript after the C indicates that there are 8 carbon atoms in the molecule.
The subscript after the H indicates that there are 18 hydrogen atoms in
the molecule.
Significance of a Chemical Formula-covalent
• A chemical formula indicates the relative number of atoms of each kind in a
chemical compound.
• For a molecular compound, the chemical formula reveals the number of atoms of
each element contained in a single molecule of the compound.
• example: octane — C8H18
mono
di
tri
tetra
penta
1
2
3
4
5
CO
Carbon monoxide
SiO2 Silicon dioxide
SO3 Sulfur trioxide
SCl4 Sulfur Tetrachloride
SbCl5 Antimony pentachloride
hexta
hepta
octa
nona
6
7
8
9
UF6 Uranium hextafloride
IF7 Iodine heptafloride
C3H8 Tricarbon octahydride
deca
10
Al(NO3)3*9H2O Aluminum nitrate
nonahydrate
P4O10 Tetraphosphorous decoxide
Acids
•
An acid is a certain type of molecular compound. Most acids used in the
laboratory are either binary acids or oxyacids.
• Binary acids are acids that consist of two elements, usually hydrogen and
a halogen.
• Oxyacids are acids that contain hydrogen, oxygen, and a third element
(usually a nonmetal).
• In the laboratory, the term acid usually refers to a solution in water of an acid
compound rather than the acid itself.
• example: hydrochloric acid refers to a water solution of the molecular
compound hydrogen chloride, HCl
• Many polyatomic ions are produced by the loss of hydrogen ions from oxyacids.
examples:
sulfuric acid
H2SO4
sulfate
SO4
nitric acid
HNO3
nitrate
NO3
phosphoric acid
H3PO4
phosphate
PO4
Acids are compounds in which the "cation" is H+. (These are not really ionic compounds,
but we'll get into that later.) These can be named as compounds as in the previous cases,
e.g., HCl is "hydrogen chloride", but are more frequently given special "acid names"
(especially when dissolved in water, which is most frequently the case.) The word
"hydrogen" is omitted, the word "acid" is added to the end; the suffix is changed as
shown below:
Compound name Acid name
-ate
-ic + acid
-ite
-ide
-ous + acid
hydro- -ic + acid
Examples
Example
HClO3
H2SO4
HClO2
HCl
Compound Name
hydrogen chlorate
hydrogen sulfate
hydrogen chlorite
hydrogen chloride
Acid name
chloric acid
sulfuric acid
chlorous acid
hydrochloric acid