MT2_2009 - Chemistry 1A, Spring 2009 Midterm 2, Version...

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Page 1 of 10 Chemistry 1A, Spring 2009 Midterm 2, Version March 9, 2009 (90 min, closed book) Name:___________________ SID:_____________________ TA Name:________________ There are 20 Multiple choice questions worth 2.5 points each. There are 3, multi-part short answer questions. For the multiple choice section, fill in the Scantron form AND circle your answer on the exam. Put your written answers in the boxes provided. Full credit cannot be gained for answers outside the boxes provided. 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] 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
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Page 2 of 10 Thermodynamics: G ° = H ° - T S ° H ° = Σ H ° f (products) - Σ H ° f (reactants) S ° = Σ S ° (products) - Σ S ° (reactants) G ° = Σ G ° f (products) - Σ G ° 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 ° + RTln Q G = G° + RTln(a); a = activity = γ P/P° or γ [A]/[A]° G ° = - RTln K G ° = - nF Є º Є = Є º - (RT/nF) lnQ R S T R H K ° + ° = 1 ln T = ik b,f m Π = 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] 0 e -kt ln[A] t = ln[A] 0 – kt t 1/2 = ln2/k 1/[A] t = 1/[A] 0 + 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] 0 k t 1/2 = [A] 0 /kt Quantum: E = h ν λν = c λ deBroglie = h / p = h / mv E kin (e-) = h ν - Φ = h ν - h ν 0 = 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 + ½) hA/2 π ; A =(k/m) ½ Rotational: E n = n(n + 1) hB; B = h/8 π 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 0 = 6.02214 x 10 23 mol -1 R = 2.179874 x 10 -18 J R = 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
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Page 3 of 10 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?
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MT2_2009 - Chemistry 1A, Spring 2009 Midterm 2, Version...

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