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MT3_KEY - Chemistry 1A Spring 2009 KEY Midterm 3(90 min...

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Page 1 of 11 Chemistry 1A, Spring 2009 KEY Midterm 3 April 13, 2009 (90 min, closed book) Name:___________________ SID:_____________________ TA Name:________________ There are 20 Multiple choice questions worth 3 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] Question Points Score Multiple Choice Section 60 Question 21, K and G 8 Question 22, Multiple K 13 Question 23abc, Haber 9 Question 23defg, Haber 10 Total 100
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Page 2 of 11 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 Quantum: E = h ν λ ν = 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 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 = 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
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Page 3 of 11 M ULTIPLE C HOICE One mole each of gaseous He, CO 2 and NH 3 are placed in a sealed container. The volume of the container is initially 20 L and the temperature is 298K. 1) Which gas has the lowest kinetic energy? [CQ 20.1] A) He B) CO 2 C) NH 3 D) they are all the same 2) Which gas has the most frequent number of collisions with the container walls? [HW 72]
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