177Exam2KeySS07

177Exam2KeySS07 - Prof Joe Burnett Summer 2007 This exam...

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Unformatted text preview: Prof. Joe Burnett Summer 2007 This exam consists of 22 questions on 9 pages. CHEM 177 Hour Exam II June 15, 2007 Name______________________ Recitation Instructor Circle one: Cherry Gloria GRADING PAGES Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 TOTAL POINTS 22 pts 16 pts 17 pts 12 pts 24 pts 12 pts 3 pts 106 pts SCORE ________ ________ ________ ________ ________ ________ ________ Note: The method that you use in solving questions must be clearly shown to receive full credit. Questions are written on both sides of each page. A periodic table, solubility rules, and other important information is on the last page of the exam. This may be removed and used for scratch paper and reference. Do not put answers on the data page – it will not be graded. Answer Key 2 1. (4 pts) Mixing which one of the following will produce a precipitate? A. NaNO 3 (aq) & KCl (aq) B. BaCl 2 (aq) & Na 2 SO 4 (aq) C. HCl (aq) & KOH (aq) D. Pb(NO 3 ) 2 (aq) & Ti(C 2 H 3 O 2 ) 4 (aq) E. AgC 2 H 3 O 2 (aq) & Sr(NO 3 ) 2 (aq) F. None of the above 2. (4 pts) Which one of the following substances is a strong base? A. HC 2 H 3 O 2 (aq) B . L i O H (aq) C. H 2 SO 4 (aq) D . N H 3 (aq) E. CH 3 OH (aq) F. None of the above 3. (4 pts) Which of the following species is a weak electrolyte in water? A. Li 2 CO 3 B. NO 2 C . N H 3 D. C 2 H 6 OH E. All of the compounds listed are weak electrolytes. F. None of the compounds listed are weak electrolytes. 4. (4 pts) Gamma rays have wavelengths on the order of 10 –12 m and X rays have wavelengths on the order of 10 – 9 m. Which one of the following statements regarding these forms of electromagnetic radiation are FALSE ? A. A photon of a gamma ray has greater energy than does a photon of an X ray. B. Gamma rays move faster than do X rays. C. X rays have lower frequencies than do gamma rays 5. (2 pts) How many sublevels are in the n = 4 energy level? ____________ 6. (4 pts) In a single atom, how many orbitals can have principle quantum number, n = 3, and magnetic quantum number, m l = 2? A. 1 B. 2 C. 3 D. 5 E. 7 4 3 7. (8 pts) Two gaseous pollutants in automobile exhaust are CO and NO. A chemist is trying to find ways to convert them to less harmful gases through the following reaction CO (g) + NO (g) → CO 2 (g) + ½ N 2 (g) Δ H = ? Given the following information, calculate the enthalpy change, Δ H, for the above reaction....
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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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177Exam2KeySS07 - Prof Joe Burnett Summer 2007 This exam...

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