Intro Chem Final Exam Answers

Intro Chem Final Exam Answers - FINAL Exam 030.101...

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FINAL Exam Introductory Chemistry 030.101 Section 2 - Professor K.D. Karlin December 17, 1997 !w&L@& N A ME (Print)---------------------------- Last First Sot. Sec. # ______ ----- -L------- - 10 pages / 20 problems (221 points) + Periodic Table (show work for maximum credit) Data: Avogadro’s Number = 6.022 x 1O23 R = 0.0821 (liter-atm)/(mole-deg) = 8.314 J K-lmole-1 = My d-)/;t+- AG” = -RT In Keq = -2.303 RT log Keq AG = AG” + 2.303 RT log Q l(lO, Balance the following chemical equations, placing the correct numerical coefficient in front of each chemical reagent shown. (a) NaBH4 + & Hz0 + I NaB02 + 1 H2 Y (b ) x .FeTi03 +s c +7Ch + aFeC13 + &Tic14 + 3 ~02 2.~10) (a) What is the conjugate acid of the hydrogen phosphate dianion, HP042- ? Answer ---@ (b) The density of a 25.0 wt % (weight percent) solution of sulfuric acid (H2SO4) in water is 1.1783 g/mL at 25 “C. (i) labels for the axes. (ii) the triple point, and its approximate temperature of occurrence. the critical point (iv) the regions indicating the different phases
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page 2 of 10 NAME &i k ‘a --__----------_--__ Sot. Sec. # __------------___-__ _ 4. (12) In each of the following Lewis structures, Z represents a main-group element. Name the group to which Z belongs in each case, and give an example of such a compound or ion that actually exists. (a> &z=ij (b) q=z-p} (cl g.( 10) A 4.22 g sample of a mixture of CaC12 and NaCl was treated to precipitate all the calcium as CaC03, which was .then heated and converted to pure CaO. The final weight of the CaO was 0.959 g. What was the percentage by L’a@&Jp-A tw2 Y 6.( 10) An aqueous solution is prepared by adding 0.050 mol of a solute to 500 g of water. For which of these solutes - sucrose, NaCl, Na2S04, KOH, or potassium acetate - is the freezing point of the resulting solution the lowest? (Explain briefly)
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FINAL Exam - Karlin Chem 03O.lOl/Section 2 December 17, 1997 page 3 of 10 NAME fiJw&!! --- -- - -- ------- Sot. Sec. # _____ -------- __-__ 7410, You have a glass tube exactly 1 meter in length. At the same instant, a cork with cotton swab soaked in hydrogen bromide solution (as a source of gaseous HBr) is placed at the
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Intro Chem Final Exam Answers - FINAL Exam 030.101...

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