chem1A-fa04-mt1-Kubinec-soln

chem1A-fa04-mt1-Kubinec-soln - Page 1 Chemistry 1A, Fall...

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Unformatted text preview: Page 1 Chemistry 1A, Fall 2004 Midterm Exam I, Version 1 Sept 21, 2004 (90 min, closed book) Name:___________________ SID:_____________________ TA Name:________________ x Write your name on every page of this exam. x This exam has 40 multiple choice questions worth 3.4 points each. Fill in the Scantron form AND circle your answer on the exam. x There is no penalty for guessing, so answer every question. x There is only one correct answer per question. Identification Sticker Name_________________________ Page 2 800 600 400 200 IR Red Green Blue UV Wavelength (nm) Color and Wavelength of Light ' G q = ' H q- T ' S q ' H q = 6 ' H q f (products) - 6 ' H q f (reactants) ' S q = 6 S q (products) - 6 S q (reactants) ' G q = 6 ' G q f (products) - 6 ' G q 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 q = - RTln K R S T R H K q ' q ' 1 ln ' G q = - nF ' pX = - log X ] [ ] [ log HA A pK pH a E = h Q OQ = c O deBroglie = h / p = h / mv E kin (e-) = h Q- ) = h Q- h Q 0 f 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 = 6.02214 x 10 23 mol-1 R f = 2.179874 x 10-18 J R f = 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 Name_________________________ P a g e 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 ) 3 5 D ) 3 7 E ) c a n t t e l l 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) cant 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 ) C C l 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]?...
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This note was uploaded on 05/04/2011 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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chem1A-fa04-mt1-Kubinec-soln - Page 1 Chemistry 1A, Fall...

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