Unformatted text preview: Lecture Date: Monday, September 17', 2007 Announcements:
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.
C. To describe chemical reactions we need
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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- Fall '07