chem1A-fall03-final-Head_Gordon-soln

chem1A-fall03-final-Head_Gordon-soln - Chemistry 1A, Fall...

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Page 1 Chemistry 1A, Fall 2003 Final Exam, Version A Dec 10, 2003 (180 min, closed book) KEY Name:___________________ SID:_____________________ TA Name:________________ Write your name on every page of this exam. This exam is multiple choice. Some questions have more than one correct answer. Mark all that apply. Fill in the Scantron form AND circle your answer on the exam. Each question is worth 3.89 points.
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Page 2 Potentially useful relations: 800 600 400 200 IR Visible UV Wavelength (nm) Color and Wavelength of Light compound G° (kJ / mol) CO 2 -394.36 H 2 O (g) -228.57 C 6 H 12 O 6 -910 O 2 0 G° of Formation 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 Gas Constant: R = 8.31451 J K -1 mol -1 R = 8.20578 x 10 -2 L atm K -1 mol -1 T (K) = T (C) + 273.15 F = 96,485 C / mol 1 V = 1 J / C 1 nm = 10 -9 m 1 kJ = 1000 J Cp(H 2 O) = 4.184J/g K 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 for aA + bB cC + dD b a d c B A D C Q ] [ ] [ ] [ ] [ = At equilibrium, Q = K G ° = - RTln K R S T R H K ° + ° = 1 ln G ° = - nF Є º pX = - log X ] [ ] [ log HA A pK pH a + = E = h ν λν = c λ deBroglie = h / p = h / mv p = mv E kin = ½ mv 2 E kin (e-) = h ν - Φ = h ν - h ν 0 = R n Z E n 2 2 PV = nRT RT E kin 2 3 = M 3RT v rms = E = q + w w = - P ext V T nR E = 2 3
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Name_________________________ Page 3 Points 1 and 2 represent the work functions in frequency units of two different metals on the plot of photo-electron kinetic energy vs. photon frequency for a photoelectric effect experiment. Use the photon frequencies labeled A, B, C and D to answer the following four questions. 1.) Which photon ejects an electron with the greatest kinetic energy from metal 1? A) A B) B C) C E) none 2.) Which photon will not eject an electron from either metal? B) B C) C D) D E) none 3.) Which photon ejects an electron from metal 2? A) A B) B C) C D) D 4.) What is the wavelength (nm) of photon A if the frequency at point ‘A’ is 3.0 x 10 14 Hz (in the infrared region of the electromagnetic spectrum)? B) 1500 C) 2200 D) 3300 E) 4200 Continue with the next question: Consider the electronic energy levels of the He + ion for the following three questions. 5.) What is the ground state energy in units of R (Rydbergs)? A) -9 C) 0 D) 4 E) 16 6.) What wavelength photon is required to excite this ion from its ground state to first excited state (nm)? A) 1.00 B) 3.14 C) 13.5 D) 18.8 7.) What is the ionization energy of the ion in units of R ? A) -9 B) -4 C) 0 E) 16 Continue with the next question: A D C B KE frequency 1 2
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Name_________________________ Page 4 8.) Which atomic orbital has the greatest number of radial nodes? A) 1s B) 2s D) 3p E) 4d 9.) The process of removing an electron from a neutral element in the gas phase. .. A) requires energy for all elements, because the initial state is less stable than the final state. B) C) does not require energy for any element, because the initial state is the same energy as the final state.
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chem1A-fall03-final-Head_Gordon-soln - Chemistry 1A, Fall...

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