chem1A-fall04-mt1-Kubinec-soln

chem1A-fall04-mt1-Kubinec-soln - Chemistry 1A, Fall 2004...

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Page 1 Chemistry 1A, Fall 2004 Midterm Exam I, Version 1 Sept 21, 2004 (90 min, closed book) Name:___________________ SID:_____________________ TA Name:________________ Write your name on every page of this exam. This exam has 40 multiple choice questions worth 3.4 points each. Fill in the Scantron form AND circle your answer on the exam. There is no penalty for guessing, so answer every question. There is only one correct answer per question. Identification Sticker
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Name_________________________ Page 2 800 600 400 200 IR Red Green Blue UV Wavelength (nm) Color and Wavelength of Light 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 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. .. PV = nRT RT E kin 2 3 = M 3RT v rms = E = q + w w = - P ext V T nR E = 2 3 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
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Page 3 S ECTION 1: A TOMS , M OLECULES AND M OLES Questions 1 - 4 refer to any of the various chlorofluorocarbon (CFC) molecules found as pollutants in the air. Each question may refer to a different CFC. 1.) What will the atomic number be of an individual chlorine atom that is removed from a chlorofluorocarbon (C x Cl y F z ) pollutant in the air [hw 2.35]? A) 16 B) 17 C) 35 D) 37 E) can’t tell 2.) What is the relative mass (amu) of an individual chlorine atom that is removed from a chlorofluorocarbon (CFC) pollutant in the air [hw 2.35, 2.29]? A) 35 B) 36 C) 37 D) 35.45 E) can’t tell 3.) What is the empirical formula of a chlorofluorocarbon which is composed of 59% chlorine, 31% fluorine and 10 % carbon by weight [hw 3.49]? A) CClF 3 B) C 2 Cl 2 F 2 C) CCl 3 F D) CCl 2 F 2 E) C 3 Cl 2 F 4.) Which is an explanation for the peaks in the following region of the mass spectrum of a fragmented chlorofluorocarbon [hw 2.27, cq 2.1]? A) 35 Cl and 37 Cl in 1:1 ratio B) 19 F and 35 Cl in 1:1 ratio C) 19 F and 18 F in 2:1 ratio D) 35 Cl and 37 Cl in 1:3 ratio E) 35 Cl and 37 Cl in 3:1 ratio Continue with the next question: 5.) What is the identity of an atom with atomic number 35 and mass number 81 [hw 2.32]? A) Br
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This note was uploaded on 03/30/2010 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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chem1A-fall04-mt1-Kubinec-soln - Chemistry 1A, Fall 2004...

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