201F09Dex2 - Chem 201-04 EXAM 11 INFORMATION SCRAP AND...

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Unformatted text preview: Chem 201-04 ' EXAM 11 ' October 15, 2009 INFORMATION, SCRAP, AND COVER PAGE This page contains information which may or may not be needed. This page can also be used for scrap paper or for cover paper. THIS PAGE WILL NOT BE COLLECTED. TEAR THIS PAGE OFF THE EXAM. SOLUBILITY TRENDS For purposes of this course, we will use the following trends to predict whether a compound is soluble or insoluble. These guidelines are given in a priority sequence: use them in this order. Group 1 (1A) compounds, ammonium compounds, and acids are soluble. All nitrates, acetates, chlorates, and perchlorates are soluble. Silver, lead, mercury(I) and copper(I) compounds are INSOLUBLE. A Sulfates are soluble except calcium sulfate and barium sulfate. 1. 2 3 4. Chlorides, bromides, and iodides are soluble. 5 6 Compounds with anions of 2— or 3— charge are INSOLUBLE. 7. Hydroxides are INSOLUBLE except calcium hydroxide and barium hydroxide. Temperature conversion T(K) = T(°C) + 273 Gases atm = 760 mmHg = 760 Torr PV = nRT . I. 2 R = 0.0820639}: = 8,314 2 g m mol ' K s ° mol ' K 3 RT 11 = __._____.. rms M Chem 201-04 EXAM II October 15, 2009 PRINT NAME SIGN NAME CIRCLE your recitation section in the list below. Section A: M 8:00 NS 110 B: M 9:00 EH 110 C: M 12:00 CB 16 D: M 10:00 CB 16 E: R 1:00 NS 30 F: F 10:00 NS 108 G: F 8:00 NS 128 SCORED GRADE: All answers should be with the correct significant figures. Atomic weights are provided in the Periodic Table. These values must be used. The Periodic Table and the Information Page will not be collected. They may be used as scratch paper or as cover paper. Do not turn them in. If you wish to check your answers against the key, you can copy your answers to these pages. Be certain your answers are clear. If an answer is not clear, it can be considered wrong. Problems marked with ** in the margin are directly from the assigned homework. These total 39 points. ' Place your name in the space provided at the top of each question page. This helps to identify the pages if they are accidentally separated during grading and processing. Work promptly. Use your time effectively. 19* 1. 2. last name: (30 pts) Indicate whether each statement is true (T) or false (F). Be certain T or F is clearly indicated. When a reaction is conducted at stoichiometric conditions, no reactants are left in excess afterwards. A solution of sugar water is a heterogeneous mixture. All solutes which can dissolve in water will also dissociate in water. HNO2 dissociates completely when dissolved in water. Acetic acid is a nonelectrolyte. Hydrocyanic acid is an oxyacid. During a redox reaction, the oxidation number of the reductant decreases. It is much easier to compact a gas sample than a liquid sample. The pressure of a gas is proportional to its concentration times temperature. As temperature increases, the kinetic energy of a gas sample increases. (5 pts) A sample of concentrated nitric acid has a density of 1.41 g/mL and contains 70.0% HNO3 by mass. Circle the molarity of the solution. 12.2 12.6 12.9 13.0 13.3 13.6 14.2 14.7 14.9 15.0 15.4 15.7 '(8 pts) Consider the combustion of isopropyl alcohol, C3H80, given by the following balanced equation. The density of C3H80 is 0.786 g/mL. Circle the mass (in g) of water which can be made in the combustion of 50.0 mL of C3H80. 11.8 15.3 22.3 28.0 30.6 37.9 45.9 47.1 53.4 57.2 60.0 64.8 19* *9: *1: last name: (7 pts) Consider mixing the following aqueous solutions. potassium carbonate + barium hydroxide Write the balanced, undissociated (molecular) equation for the precipitation reaction on the line below. (6 pts) The following equation is balanced. 2H+ + 2Hgo2 + 201‘ + CH4 —. CH2012 + 4H20 For this equation, answer the following questions. Which element is increasing its oxidation number? Which reactant gains electrons? How many electrons are transferred in this reaction? (9 pts) Three 5-L flasks, fixed with pressure gauges and small valves, each ; contain 4 g of gas at 273 K. Flask A contains H2, flask B contains He, and ask C contains'CH4. Rank the flask contents in terms of each of the following. pressure: average molecular kinetic energy: density: (7 pts) Circle the total volume (in L) of gaseous products, measured at 350 °C and 735 Torr, when an automobile engine burns 100. g of CSH18 (a typical component of gasoline). 326 370. 417 455 509 532 633 696 709 787 835 858 ** *1: last name: 8. (6 pts) Balance the following reaction. All reactants and products are shown. Mno; + so? + H20 —. Mno2 + S04?” + OH‘ 9. (5 pts) Circle the value for ums (in m/s) for SF6 at 25 °C. 137 179 226 268 307 361 440. 493 516 554 602 628 10. (2 pts) Give the formula of one weak base. (2 pts) Give the formula of the salt formed in the reaction of potassium hydroxide and nitric acid. (2 pts) Give the formulas of all spectator ions in the reaction of aqueous sodium carbonate and hydrobromic acid. 11. (5 pts) Circle the molar concentration for the cleaning solution which is formed when 10.0 L of ammonia gas at 33 °C and 735 Torr dissolves in enough water to give a final volume of 0.750 L. 0.347 0.366 0.406 0.469 0.514 0.572 0.619 0.635 0.741 0.769 0.868 0.890 12. (6 pts) Circle the total pressure (in atm) for a mixture of 1.000 g N2 and 1.000 g 02 in a volume of 1.767 L at 4 °C. 0.317 0.352 0.459 0.511 0.402 0.539 0.648 0.669 0.754 0.776 0.828 0.861 ...
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201F09Dex2 - Chem 201-04 EXAM 11 INFORMATION SCRAP AND...

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