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Lecture_11 - This Week Exam Information Average 83.4 130 Hi...

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This Week, 9/29/07 Exam Information Average: 83.4 / 130 Hi: 123.5 Lo: 19.5 Course Information (2 labs, 5 HW, 1 Exam) Average: 159 A > 189 Max: 240 B > 168 99 th %: 210 C > 147 D > 126
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Energy Content There is a 25% loss in energy when using a mix of 85% ethanol and 15% gasoline as compared to 100% gasoline. Why? Ethanol: CH 3 CH 2 OH(l) + 3 O 2 (g) 2 CO 2 (g) + 3 H 2 O(g) ΔH = 30 kJ/g Octane, a good approximation to gasoline: C 8 H 18 (l) + 16½ O 2 (g) 8 CO 2 (g) + 9 H 2 O(g) ΔH = 48 kJ/g
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CPS question #1 solo Which is endothermic (absorbs energy) A. B.
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CPS question #2 solo Which describes the types of electrons in formaldehyde?
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Electrostatic attraction and repulsion in covalent compounds
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Energy of H + H
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Parameters of a H 2 bond Energy required to overcome the electrostatic attraction of a bond and separate its components as isolated atoms. Distance between nuclei at which potential energy is lowest.
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CPS Question #4 & #5
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Lewis Electron-dot Structures Number of dots = number of outer (valence) electrons Leave a maximum number unpaired. This is NOT the arrangement in some isolated atoms Rules: Depicting Valence Electrons in Main Group Atoms
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