#Chem 162-2008 13th, 14th & 15th week trunc combined recitation

#Chem 162-2008 13th, 14th & 15th week trunc combined recitation

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CHEMISTRY 162-2008 13 th , 14 th & 15 th WEEK COMBINED RECITATION ANNOUNCEMENTS MISCELLANEOUS This week: final recitation. Fill out rating survey for me EXAMS Final exam, Monday, May 12 th , 12:00 - 3:00 PM - Chapters 12-19, 22.7-22.9 Importance of final exam (Worth more than 220 points) - For borderline students: trend - For “A” students (borderline or not) - For all students whose score is   35% STUDY!  STUDY!  STUDY! - Stop part-time jobs, sports practicing, partying, etc. Review session for final:  TBD by e-mail 8-10 PM Mon, 5/5? (last day of class) Tue, 5/6? (reading day) Wed, 5/7? (reading day) Thu, 5/8? Urgent to prioritize review session topics, upon receipt by e-mail PHILOSOPHY Come to class early for philosophy. - Career: Job money vs. Job love - Career: Grades as guide? ATTENDANCE Sign in EXAM III How did we do? Chem 162-2007 13th,14th & 15th week combined recitation 1
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Chem 162-2007 13th,14th & 15th week combined recitation 2
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PLAN FOR TODAY : CHAPTER 18 - ELECTROCHEMISTRY Electric work/Amperes CHAPTER 19 – NUCLEAR CHEMISTRY Radioactive decay and nuclear transformations Kinetics of radioactive decay Energy change in nuclear reactions Chem 162-2007 13th,14th & 15th week combined recitation 3
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Z&Z 79 (modif.) ET: Ampere calculations; Ohm’s law: E = IR CHEM 162-2006 13th,14th & 15th WEEK RECITATION ELECTROCHEMISTRY ELECTRIC WORK/AMPERES How many moles of F 2 gas are produced when molten KF is electrolyzed by a current of 10.0 A for 2.00 hours? E o 2F - F 2 + 2e - -2.87 2(K + + e - K) -2.92 2F - + 2K + F 2 + 2K -5.79 Amperes x ((Coulombs/sec)/Ampere) x sec x (1 mol e - /96485 coulomb) x (mol product/mol e - ) = mol product 10.0 A x ((1C/s)/A) x (2.00 hrs x 60 min/hr x 60 sec/min) x (1 mol electrons/96485 C) x 1 mol F 2 /2 mol electrons = 0.373 mol F 2 or (amperes x seconds)/(96485 x electrons) = moles product ((10.0 A) x (2.00 h x 60 m/h x 60 s/m))/(96485 x 2) = 0.373 mol F 2 ET : Point out all of the parameters that can be requested on an exam including volume and charge. Chem 162-2007 13th,14th & 15th week combined recitation 4
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SELECTED EQUATIONS FOR NUCLEAR CHEMISTRY CAPTURED OR EMITTED PARTICLES/RAYS Alpha particles 4 2 α = 4 2 He Sum of protons and neutrons = mass number (neutrons and protons are nucleons) Beta particles 0 -1 β = 0 -1 e Number of protons (or charge) = atomic number Gamma ray 0 0 γ Positron particle 0 1 e Neutron 1 0 n Proton 1 1 H RADIOACTIVE DECAY RATE Reaction Differential Order Rate Law rate law
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#Chem 162-2008 13th, 14th & 15th week trunc combined recitation

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