Unformatted text preview: Lecture Date: Wednesday, September 12, 2007 Announcements:
0 Lecture slides have been posted 1. Representation of Covalent Compounds:
A. Element: AxByCz. ..
l. A, B and C represent the various elements present in the compound and x, y and 2
represent counts of the atoms of the respective elements. B. Empirical formula:
1. It corresponds to the naming with no common integers between x, y and 2.
We only have ratios of quantities of species A to species B to species C. C. Formula unit:
1. It represents the number of atoms in one chemical unit/ molecule.
Example: C6H12016 (glucose)
This means glucose has 6 units of CHZO in one molecule. D. Structural formula; ,
1. It is basically arrangements of atoms and bonds.
2. Example: There are 2 arrangements of C4H10
a. Butane and Methyl propane.
b. Both have different properties.
3. Compounds with same number of atoms but different arrangements are called isomers.
H H H H
| | I |
H — C — C — C — C — H Butane (melting point = -O.5 degree Celsius) ||||
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- Fall '07