exam 2 fall - NAME(Please PRINT NAME(Please PRINT C102A...

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C102A Examination 2 Fall,2008 I pledge on my honor that I have neither given nor received improper aid on this examination. ______________________________ (Signature) Directions: 1. No books or notes may be using during this test. There should be no data stored on your calculator for use on the exam. This includes but is not limited to periodic tables and chemical equations and formu- las. 2. There are a total of 10 sections (some with several parts) for a sum of 100 points. 3 Be certain that, wherever applicable, you show your work . Problems in sections 5-10 that are an- swered without showing work will not receive credit . 4. Please note: there are no intentionally misleading questions on this test. Each problem should be taken at its face value. You must, however, be certain to read each problem carefully! 5. If you have any questions please ask your professor. X DO NOT REMOVE THIS PAGE FROM YOUR EXAM!!!!! W Please be sure that you are officially enrolled in the section named below: Section 1– Engers, Julie Le Exam Score________ NAME (Please PRINT)
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2 SECTION 1 1. TRUE OR FALSE (15 PTS. TOTAL; 3 PTS. EACH) ) Circle either True or False for each answer. (a). Enthalpy, H, and heat, q, are both state functions. True False (b). The reaction representing o f H Δ for Ca(NO 3 ) 2 (s) is Ca(s) + N 2 (g) + 3O 2 (g) Ca(NO3) 2 (s). True False (c). The electron configuration for the nitrogen atom is [Ne]3s 2 3p 3 . True False (d). An electron in a 4f orbital can have the quantum numbers of n=4, l =2, m l =-2 and m s =1/2. True False (e). Communication waves used in cell phones have longer wave- lengths than the sun rays used to tan the skin. True False SECTION 2 MULTIPLE CHOICE (21 PTS. TOTAL; 3 PTS. EACH) Pick the one best answer; if you circle more than one, you will receive NO credit! (1). The transition of an electron, in a hydrogen atom, from n=4 to a lower level results in the emission of light of wavelength 1876 nm. The principal quantum number for that lower level is : (a). 0 (b). 1 (c). 2 (d). 3 (e). None of these (2). Photosynthesis in plants uses 5645 kJ of energy to produce one mol of sucrose (C 12 H 22 O 11 ). If sunlight supplies 1 kJ energy per second, then the number of hours of sun light needed to produce 109 g sucrose via photosynthesis is : (a). 1 hr (b). 24 hrs (c). 0.5 hr (d). 1799 hrs (e). None of these (3). A styrofoam cup calorimeter has a heat capacity of 84.5 J/K. When a certain amount of NH 4 NO 3 (s) is dissolved in 100.0 g of water in the calorimeter at 25 o C, the temperature inside ca- lorimeter dropped to 22.93 o C. The heat absorbed by the dissolution reaction must be: (a). 175 J (b). 866 J (c). 691 J (d). 1041 J (e). None of these 3 ; 16 1 1 10 18 . 2 10 1876 ) . 10 3 )( . 10 626 . 6 ( 1 1 10 18 . 2 2 2 18 9 1 8 34 2 2 18 2 1 2 = = × × × × = = Δ n n x m s m s J n n hc E λ hr s hr kJ s mol kJ mol g g 5 . 0
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This note was uploaded on 03/06/2010 for the course CHEM 102B taught by Professor A during the Spring '09 term at Vanderbilt.

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exam 2 fall - NAME(Please PRINT NAME(Please PRINT C102A...

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