lecture7 - Chem 1A Lewis structures I Midterm I Mean 61.0...

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Lewis structures I Chem 1A
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Midterm I Thumbs up! Mean: 61.0 Std.: 14.3
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Relative badness of calculation sins Wrong order of magnitude: Totally wrong! Inappropriate significant figures: Pretty bad. Not so bad. Small rounding error: If the answer is 3.08 x 10 -19 J, 3.08 x 10 -9 J 3.08348672345 x 10 -19 J 3.07 x 10 -19 J
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Common mistakes Ionization energy The hydrogen atom is in the ground state. A photon of energy 3.33 x 10 -18 J arrives at the atom. Is the energy of the photon enough to ionize the hydrogen atom? n =1 n =2 n =3 n =4 n =5 n = ʿ E transition " E = # R H Z 2 n f 2 # Z 2 n i 2 $ % ( ) To ionize an atom, the final state is n = ʿ± Δ E = - R H (0-1) = R H = 2.178 x 10 -18 J 3.33 x 10 -18 J > 2.178 x 10 -18 J Yes, there is enough energy!
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Common mistakes Electron configuration Cu : Tc 2+ : Cr 2+ : Ag : Mn 2+ : [Ar]4s 1 3d 10 [Kr]5s 1 4d 10 [Ar] 3d 4 [Kr] 4d 5 [Ar] 3d 5
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Common mistakes Periodic trends Rank the following elements from smallest to largest ionization energy: Be, C, Li, B Li < B < Be < C
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Common mistakes Periodic trends Which element, X = I or Cl is more reactive in the reaction: 2X 2 (g) + 2H 2 O(l) HX(aq) + O 2 (g) Cl, because Cl has a higher electron affininty
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This note was uploaded on 02/25/2012 for the course CHEM 1A 40030 taught by Professor Borovick during the Fall '10 term at UC Irvine.

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lecture7 - Chem 1A Lewis structures I Midterm I Mean 61.0...

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