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Lecture15 - Administrative stuff Q23 on HW6 has now been...

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Administrative stuff Q23 on HW6 has now been given as full credit to all. At the end, when the option to drop the lowest two HW is done, I’ll count each of HW3/4 and HW7/8 as one HW. HW answer keys are available through Quest. Some of the answers are missing. If you’d like an answer, email me, and I’ll upload it to the BB discussion board for all. Once this exam is over, I’ll upload all grades (HW, exams, clicker) into Blackboard. Help before exam Office hours today: Christine: 4–6 pm in Jester DrRuth: 7:30 - 9:30 pm in WEL 3.153 (DrRuth’s office) Exam review with Christine was yesterday – very low attendance No exam review sheet sorry. That’s what today’s lecture is.
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Ike update Ike came home last night! The rummage/garage/bake sale last weekend made almost $4K. Big bake sale on campus at Texas State U right now. Details on www.ikeasaurus.com. Exam Two! TOMORROW Wed 3/11, 7 - 9 pm, WEL 1.308. You will need: non-programmable calculator (? not really) UT student ID card several #2 pencils empty bladder You may not leave before, or start after, 7:45 pm. Once you leave, you may not return.
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10% : periodic trends (Chapter 12.15) 75% : bonding, lewis structures, VSEPR (Chapter 13) 15% : VB theory (Chapter 14.1) 0%: MO theory (next time) There are 34 questions. Some easy. Some harder. Some theory/concept stuff. Not as many calculations. Lots of structures. There is one question on the exam about MO theory. Everyone’s exam is numbered differently, but it’s the question asking about “anti-bonding” orbitals. Skip that question Everyone will get full credit for it.
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Homework problems The class average for each of HW7 and HW8 is 77% (noon) On most of the questions the class average was 85 % The questions that people found harder are scattered throughout this review. I suggest you revise all HW problems I did during class in the last month. atomic radii ionization energy X(g) X + (g) + e isoelectronic = same number of electrons Periodic Trends
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electron affinity X(g) + e X (g) ionic radii Periodic table The number of valence electrons determines the chemistry of an atom. Representative (main group), transition, actinide, lanthanide Alkali, alkaline earth, halogens, noble gases metals, non-metals, metalloids Periodic trends across a row more positive charge on nucleus no change in core electrons, thus no change in shielding effective nuclear charge increases valence electrons are more attracted to core Periodic trends down a column more positive charge on nucleus another shell of core electrons, thus more shielding effective nuclear charge unchanged valence electrons are further from nucleus, decreasing attraction to core
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Bonds form when they result in a species that is more stable (lower system energy) than the isolated atoms.
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