chem1a-spring03-final-Douskey-soln

chem1a-spring03-final-Douskey-soln - Name_ TA _ DOUSKEY...

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Name__________________ TA ____________________ DOUSKEY Chemistry 1A, Spring 2003 Final Exam-KEY May 19, 2003 (270 min., closed book) N a m e : T A : S I D : S e c t i o n : Please read this first: Write your name and that of your TA on all 17 pages of the exam Test-taking Strategy This test consists of two parts: multiple choice (answers to be entered in the boxes provided ) and short answer. In order to maximize your score on the exam: Do the questions you know how to do first. Go back and spend more time on the questions you find more challenging. Budget your time carefully -- don't spend too much time on one problem. Show all work for which you want credit and don't forget to include units. Question Page Points Score Multiple Choice 4-12 160 A- Kinetics 13 24 B- Electrochemistry 14 36 C- Structure and Reactivity 15 18 D- Acid Base Equilibria 16 26 E- Light and Molecular Structure 17 16 Total 280
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Name__________________ TA ____________________ E=h ν λν = c λ deBroglie = h / p = h / mv T star = 2.898 mm· K/ λ max E kin (e - ) = h ν - Φ = h ν - h ν o E kin = ½mv 2 E kin = 3RT/2 v rms = (3 / ) R TM E n = -R (Z 2 /n 2 ) E = -R (Z 2 /n f 2 - Z 2 /n i 2 ) R = 2.18 × 10 -18 J k B = 1.381 × 10 -23 J/K m e- = 9.11 × 10 -31 kg h = 6.626 × 10 -34 J s c = 3.0 × 10 8 m/s 1 nm = 10 -9 m 1 kJ = 1000 J 1 Torr = 1 mmHg 1 atm = 760 mmHg J = (kg m 2 )/s 2 1 eV = 1.602 × 10 -19 J PV = nRT MM = mRT / (PV) T(K) = T(C) + 273.15 R = 0.0821 L·atm / (mol·K) R = 8.314 J / (mol K) A = ε lC P a = X a P tot P = F/A E = q + w G ° = H ° - T S ° G = G ° + RT ln Q G ° = -RT ln K q = mC s T w = -P ext V H ° = Σ∆ H ° f (products) - Σ∆ H ° f (reactants) N A = 6.022 × 10 23 1 cal = 4.18 J 101.3 J = 1 L atm K a K b = K w K w = 10 -14 pX = -log X pK a + pK b = pK w pH = pKa + log - [] A HA E cell = E cathode E anode G D =− nFE cell D F = 96,485C/mol e-
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Name__________________ TA ____________________ Table of Standard Reduction Potentials 2 H + (aq) + 2 e- H 2 (g) 0
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Name__________________ TA ____________________ Multiple Choice. (4 points each, 160 points total) Determine the best answer to the questions below and write your answer in the box provided. 1.) Which neutral atom could have the configuration 1s 2 2s 2 2p 6 3s 2 3p 5 4s 1 ? A) K B) Cl C) Na D) E) S 2.) A mixture of oxygen atoms was allowed to react to form O 2 molecules. Based on the mass spectrum below, which statements are true? 32 34 36 A) 32 O, 34 O, and 36 O isotopes are present in the sample B) there is only one isotope of oxygen present in the sample C) carbon dioxide was formed in the reaction D) there are two isotopes of oxygen in a 3.) A molecular picture for the reaction of H 2 and NO is shown below. 2H 2 + 2NO N 2 + 2H 2 O Legend: H= N= O= + Which of the diagrams below best represents the molecules after the reaction has taken place? (Circle one)
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Name__________________ TA ____________________ 4.) Which of the following is a valid set of quantum numbers for an electron in a 2p orbital? A) n=2, A =2, m A =0 B) n=1, A =3, m A =3 C) n=2, A =1, m A =1 D) n=3, A =1, m A = -1 E) n=1, A =2, m A =3 5.) A photon of wavelength 270 nm has the minimum energy needed to eject an electron from chromium metal. What effect will a photon of 540 nm have on chromium?
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chem1a-spring03-final-Douskey-soln - Name_ TA _ DOUSKEY...

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