e3p302 and key - CH302 Practice Exam 3-calculator free 1....

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CH 302 Practice Exam 3 -- calculator free 1. For the cell diagram Pt|H 2 (g),H + (aq) Cu 2+ (aq)|Cu(s) which reaction occurs at the anode? A. Cu(s) Cu 2+ (aq) + 2e B. 2H + (aq) + 2e H 2 (g) C. 2H + (aq) + Cu(s) H 2 (g) + Cu 2+ (aq) D. Cu 2+ (aq) + 2e Cu(s) E. H 2 (g) 2H + (aq) + 2e 2 . Consider the reaction below. 2A + B 2 2AB Rate = k [A] 2 [B] Which of the following mechanisms is likely and consistent with the experimental rate law? 1. A + A + B 2 2AB 2. B 2 2B K , fast A + B AB k , slow 3. B 2 2B k 1 , slow A + B AB k 2 , fast 4. 2A A 2 K , fast B 2 + A 2 2AB k , slow A. 2 B. 3 C. 4 D. 1 E. 2 and 3 3. Which of the following statements about the halogens is false? A. F is the most abundant halogen in the earth's crust. B. Cl is often used in disinfectants C. Br in its standard state is liquid D. I is the lest polarizable of the halogens 4. In the determination of iron in vitamins, Fe 2+ is titrated with permanganate, MnO 4 , in acidic solution. The products of the reaction are Fe 3+ and Mn 2+ . In the balanced equation, the number of electrons transferred is A. 5 B. 1 C. 10 D. 7
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5. Which of the following statements about allotropes of carbon is not true? A. It can form a gemstone B. It can conduct electricity C. It can be used to make nanotubes D. It can serve as an insulator E. Other than oxygen, it is the most common element in quartz. 6. Consider a reaction 3A --> 2B with a rate constant of 6 M min^-1. What is the starting concentration if after 10 seconds seconds the remaining concentration is 0.1M? A. .133 B. .4 C. 180.1 D. 60.1 7. Of the following compounds, which does not exist? A. NCl 5 B. PCl 3 C. PCl 5 D. NCl 3 8. Aluminum metal is produced by A. reduction of Al 2 O 3 with carbon. B. electrolysis of a molten mixture of alumina, Al 2 O 3 , and cryolite, Na 3 AlF 6 . C. treatment of Al 2 O 3 with sodium hydroxide. D. the thermite reaction. E. electrolysis of brine containing Al 2 (SO 4 ) 3 . 9. If E ° for the following cell is 0.36 V at 25°C Pb(s)|PbSO 4 (s)|SO 4 2– (aq, 0.60 M) H + (aq, 0.70 M)|H 2 (g, 192.5 kPa)|Pt How is the Nernst equation for the cell properly expressed at this temperature? A. E = 0.36 – 0.01285ln[1.90/{(0.70) 2 (0.60)}] B. E = 0.36 – 0.02569ln[192.5/{(0.70) 2 (0.60)}] C. E = 0.36 + 0.01285ln[192.5/{(0.70) 2 (0.60)}] D. E = 0.36 + 0.01285ln[1.90/{(0.70) 2 (0.60)}] E. E = 0.36 – 0.01285ln[1.90/{(0.70)(0.60)}] 10. Heptane, with the formula, C 7 H 16 , can have how many isomeric structures? A. 4 B. 5 C. 6 D. 7
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E. 9 11. WHich of the following statements about fatty acids is true? A. Unsaturated fatty acids contain reactive double bonds in the hydrocarbon chain and are good for you. B.
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This note was uploaded on 09/17/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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e3p302 and key - CH302 Practice Exam 3-calculator free 1....

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