177Exam2KeySS06

177Exam2KeySS06 - PROF. JOSEPH BURNETT SUMMER 2006 THIS...

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PROF. JOSEPH BURNETT SUMMER 2006 THIS EXAM CONSISTS OF 20 QUESTIONS ON 10 PAGES CHEM 177 HOUR EXAM II June 19th, 2006 NAME______________________ RECITATION INSTRUCTOR CIRCLE ONE: Salil Sabnis Ziwei Just GRADING PAGES Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 TOTAL POINTS 18 pts 10 pts 6 pts 12 pts 12 pts 14 pts 18 pts 10 pts 100 pts SCORE ________ ________ ________ ________ ________ ________ ________ NOTE: THE METHOD YOU USE IN SOLVING QUESTIONS MUST BE CLEARLY SHOWN IF YOU ARE TO RECEIVE FULL CREDIT. QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THE LAST PAGE CONTAINS A PERIODIC TABLE . THIS SHOULD BE REMOVED AND USED FOR ADDITIONAL REFERENCE AND SCRATCH PAPER. DO NOT PUT ANSWERS ON THE TEAR AWAY PAGE. Answer Key
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2 1. (2 pts) How many valence electrons are in a ground state S atom? __________________ 2. (2 pts) How many sublevels are in the 5th energy shell (n = 5)? ____________________ 3. (4 pts) Draw the shape of a 4d orbital. Clearly indicate any planar nodes. 4. (4 pts) Draw the shape of a 3p orbital. Clearly indicate any planar nodes. 5. (6 pts) Given the following information: 1 2 N 2 (g) + 1 2 O 2 (g) NO (g) Δ H = +90. kJ 2 NO 2 (g) 2 NO (g) + O 2 (g) Δ H = +114 kJ Calculate Δ H of the reaction: N 2 (g) + 2 O 2 (g) 2 NO 2 (g) N 2 (g) + O 2 (g) 2 NO (g) Δ H = 2 × +90. kJ 2 NO (g) + O 2 (g) 2 NO 2 (g) Δ H = –114 kJ N 2 (g) + 2 O 2 (g) 2 NO 2 (g) Δ H = 2 × +90. kJ 114 kJ = +66 kJ 6 5 Planar nodes Planar node +
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3 6. (2 pts) Consider the following exothermic reaction: H 2 (g) + 1 2 O 2 (g) H 2 O ( l ) . Which one of the following statements is TRUE? [Hint: consider the changes in volume between the reactants and products and the resultant work. You may assume that pressure is constant and nonzero.] A. The change in internal energy ( Δ E) is the same as the change in enthalpy ( Δ H). B. The magnitude of the change in internal energy (| Δ E|) is the larger than the magnitude of the change in enthalpy (| Δ H|). C. The magnitude of the change in internal energy (| Δ E|) is the smaller than the magnitude of the change in enthalpy (| Δ H|). 7. (8 pts) Ozone absorbs ultra-violet light with wavelengths shorter than 280 nm. A single ozone molecule can absorb a single photon of UV light. What is the energy in Joules of a single photon of light with a wavelength of 279 nm? Show all work and report your work with the correct amount of significant figures.
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This note was uploaded on 03/26/2008 for the course CHEM 177 taught by Professor Greenbowe during the Summer '06 term at Iowa State.

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177Exam2KeySS06 - PROF. JOSEPH BURNETT SUMMER 2006 THIS...

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