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Week 7 notes

by: Leslie Pike

Week 7 notes CHEM 120

Leslie Pike
GPA 3.9
College Chemistry I
Dr. Darwin Dahl

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About this Document

Not a lot here because I put so much of this week's notes directly into the study guide. Brief information about determining oxidation charges on atoms in compounds.
College Chemistry I
Dr. Darwin Dahl
Class Notes
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This 1 page Class Notes was uploaded by Leslie Pike on Friday October 9, 2015. The Class Notes belongs to CHEM 120 at Western Kentucky University taught by Dr. Darwin Dahl in Summer 2015. Since its upload, it has received 20 views. For similar materials see College Chemistry I in Chemistry at Western Kentucky University.

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Date Created: 10/09/15
Exam 2 will be over Chapters 3 and 4 Review session in Snell Hall 4115 Sunday at 2 pm Oxidation states of atoms WHEN THEY ARE IN COMPOUNDS Fluorine has a xed oxidation state of 1 Alkali metals have a xed oxidation state of 1 Alkali earth metals have a xed oxidation state of 2 Zinc and cadmium have xed oxidation states of 2 Silver has a xed oxidation state of 1 Hydrogen is 1 when acting as a metal and 1 when acting as a halide Oxygen USUALLY has a charge of 2 unless it is peroxide then it is 1 Everything else is variable To determine the oxidation state of a compound The charges on the atom sum to the charge on the molecule If the molecule is not charged atomic charges cancel If the molecule is charged atomic charges sum to that charge Potassium dichromate K2Cr207 has no charge Potassium has a charge of 1 oxygen has a charge of 2 the charge of chromium is not xed but can be determined with simple algebra There are two potassium ions with a charge of 1 each for a total charge of 2 The total charge for the oxygen is 14 This leaves a 12 charge that the chromium must make up for so that the molecule stays neutral There are two chromium atoms each must have a charge of 6 Another example Bicarbonate HCO339 has a charge of 1 The charges of the atoms sum to 1 Oxygen has a charge of 2 236 Hydrogen has a charge of 1 615 The molecule only has a 1 charge so the carbon must have a 4 charge Note oxidation states do not have to be integers


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