Chemical Bonding Worksheets Page 12
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22MOLECULES WITH MORE THAN ONE CENTRAL ATOM
Lewis Structures of Hydrocarbons (e.g. CH
, C
H
, C
H
, etc.)
4
2
6
3
8
– Hydrocarbons are compounds that contain only hydrogen and carbon.
– Other than methane (CH
), all hydrocarbons have more than one central atom, and the
4
carbon atoms generally form a chain, branched structure, or ring, with the hydrogen atoms
bonded to the carbon atoms.
Example: Draw the Lewis structure for each of the following hydrocarbons:
a. C
H
b. C
H
c. C
H
2
6
2
4
2
2
H
H
H
H
H
C
C
H
C
C
H
C
C H
H
H
H
H
Lewis Structures of Ternary Oxyacids (e.g. HNO
, H
SO
, H
PO
, etc.)
3
2
4
3
4
– Ternary oxyacids are molecules that contain hydrogen, oxygen, and one other element.
– Ternary oxyacids are essentially a polyatomic ion with each hydrogen in the acid
bonded to a different oxygen atom.
– In ternary oxyacids, the central atom is the “other element” which is surrounded by oxygen
atoms, and the each hydrogen atom is bonded directly to a different oxygen atom.
Example: Draw the Lewis structure for each of the following ternary oxyacid:
a. chlorous acid, HClO
2
b. sulfuric acid, H
SO
2
4
CHEM 121 Tro Chapter 10 F2012
page 12 of 22
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