Counting Atoms Pt.2 Worksheet
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1Name ____________________________
Science 8, Teacher _________________
Period ___ Date ____________________
The formula for a compound indicates the elements that make up the compound and the
number of atoms of each element present in the compound. These numbers of atoms are
indicated by the use of small numbers called subscripts. Sometimes groups of atoms act as a
single atom. The number of molecules of the compound is indicated by the coefficient in front of
the molecule.
In the following examples, list each element symbol, element name, and number of atoms
of each element present in the compound. The first example has been done for you.
Name
F
A
F
ORMULA
TOMS IN
ORMULA
C = Carbon, 15
Heptane
3C
H
5
12
H = Hydrogen, 36
Asbestos
2H
Mg
Si
O
4
3
2
9
Dichlorodiphenyl-
trichloroethane
4C
H
Cl
14
9
5
(DDT)
Silicon dioxide
5SiO
2
(Sand)
Iron oxide
6Fe
O
2
3
(rust)
Cellulose
C
H
O
(OH)
5
7
2
3
(Plant cell fibers)
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