Takenote10 - Lecture Date Monday September 17 2007...

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Unformatted text preview: Lecture Date: Monday, September 17', 2007 Announcements: - Readings: 1) All Chapter 4 2) Chapter 8: sections 1-6 1. Chemical reactions: A. The following happens when a chemical reaction takes place: 1. Color changes 2. Gases evolve 3. Energy is released or absorbed etc. B. We are more interested in the micro world. A+B—>C+D C. To describe chemical reactions we need 1. Reactants 2. Products 3. The quantities of the reactants and the products. 4. The condition under which the reaction takes place D. Example. ' 1.2Mg + COg——>2Mg0 + C a. Exchange of electrons takes place. b. This is a “Redox” reaction. Both reduction and oxidation takes place. 0. Reduction: C(4) ——» C(O) d. Oxidation: Mg(0) —) Mg(+2) E. Stochiometry ‘ Amounts (measurables) New Amounts (measurables) ( gins, volumes, Atoms / mole ( gins, volumes, Concentrations) _ Concentrations) II. Chapter 4: A. Problem 14. C12 + P4 ~> PC13 (0.337 moles of PC13) Q. How many moles of P4 and C1; are involved? ...
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