MT2+Solutions_spring 2009 - Page 1 of 10 Chemistry 1A,...

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Unformatted text preview: Page 1 of 10 Chemistry 1A, Spring 2009 KEY Midterm 2, Version March 9, 2009 (90 min, closed book) Name:___________________ SID:_____________________ TA Name:________________ x There are 20 Multiple choice questions worth 2.5 points each. x There are 3, multi-part, short answer questions. x For the multiple choice section, fill in the Scantron form AND circle your answer on the exam. x Put your written answers in the boxes provided. Full credit cannot be gained for answers outside the boxes provided. x The lecture, homework, chemquizzes, discussion or experiment that each question is based upon is listed after the question e.g. [L3, HW 1.13, CQ 7.3] x Unless it is specified otherwise, reduce formal charge when drawing structures Question Points Score Multiple Choice Section 50 Question 21 19 Question 22 18 Question 23 13 Total 100 Page 2 of 10 Thermodynamics: ' G q = ' H q- T ' S q ' H q = 6 ' H q f (products) - 6 ' H q f (reactants) ' S q = 6 S q (products) - 6 S q (reactants) ' G q = 6 ' G q f (products) - 6 ' G q f (reactants) S = k B lnW ' S = q rev /T ' E = q + w w = - P ext ' V for aA + bB cC + dD b a d c B A D C Q ] [ ] [ ] [ ] [ At equilibrium, Q = K ' G = ' G q + RTln Q G = G + RTln(a); a = activity = P/P or [A]/[A] ' G q = - RTln K ' G q = - nF ' ' = ' - (RT/nF) lnQ R S T R H K q ' q ' 1 ln T = ik b,f m = iMRT P total = P A + P B = X A P A + X B P B Acid Base: pH = - log[H 3 O + ] pX = - log X ] [ ] [ log HA A pK pH a Kinetics: [A] t = [A] e-kt ln[A] t = ln[A] kt t 1/2 = ln2/k 1/[A] t = 1/[A] + kt k = A e (-Ea/RT) ln(k 1 /k 2 ) = E a /R ( 1/T 2 1/T 1 ) t 1/2 = 1/[A] k t 1/2 = [A] /kt Quantum: E = h Q OQ = c O deBroglie = h / p = h / mv E kin (e-) = h Q- ) = h Q- h Q 0 f R n Z E n 2 2 x p ~ h p = mv Particle in a box (1-D Quantum): E n = h 2 n 2 /8mL 2 ; n = 1, 2, 3... Vibrational: E v = (v + ) hA/2 ; A =(k/m) Rotational: E n = n(n + 1) hB; B = h/8 2 I; I = 2mr 2 m = m A m B /(m A + m B ) Ideal Gas: PV = nRT RT E kin 2 3 M 3RT v rms Constants: N = 6.02214 x 10 23 mol-1 R f = 2.179874 x 10-18 J R f = 3.28984 x 10 15 Hz k = 1.38066 x 10-23 J K-1 h = 6.62608 x 10-34 J s m e = 9.101939 x 10-31 kg c = 2.99792 x 10 8 m s-1 T (K) = T (C) + 273.15 F = 96,485 C / mol 1 V = 1 J / C Gas Constant: R = 8.31451 J K-1 mol-1 R = 8.20578 x 10-2 L atm K-1 mol-1 1 nm = 10-9 m 1 kJ = 1000 J 1 atm = 760 mm Hg = 760 torr 1 bar 1 L atm 100 J P a g e 3 o f 1 M ULTIPLE C HOICE 1) Which of the following has the smallest atomic radius? [HW 1.90] A) Al B) P C) S D) Si E) Cl 2) Which of the following has the largest radius? [HW 1.92] A) S 2 B) Cl C) Cl D) K + E) S 3) Which of the following reactions require energy to occur? [Disc 4] A) Na + ( g ) + e- Na ( g ) B) F + ( g ) + e- F ( g ) C) Both A and B D) Neither A nor B 4) Which of the following species have the highest ionization energy? [HW 1.86, CQ11.2] A) K + B) Ar C) Cl- D) They have equal ionization energies....
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MT2+Solutions_spring 2009 - Page 1 of 10 Chemistry 1A,...

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