CHE21-EXAMII-practice-Sp09 - Name Chemistry 121 Exam II...

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Name _____________________________ Chemistry 121 Exam II Spring ‘09 100 points 1.Short Answer Problems a - f (30pts/6pts each) a. Combining aqueous BaI 2 and K 2 SO 4 creates a precipitate of BaSO 4 . Write the full ionic and the net ionic equation for this reaction. b. How many milliliters of a stock solution of 15.1M HNO 3 would be needed to prepare 0.500L of 0.500M HNO 3 ? c. Given the following REDOX reaction 2H 2 S(g) + 3O 2 (g) ---- 2SO 2 (g) + 2H 2 O (g) Which element is oxidized? _______________________ Which element is reduced? ________________________ What is the oxidizing agent? ________________________ What is the reducing agent? ________________________ Which element has no change in oxidation number? ____________________ What is the oxidation number of “S” in SO 2 ? ________________
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d. A scuba diver’s tank contains 0.29kg of O 2 gas compressed into a volume of 2.3L. Calculate the gas pressure inside the tank at 9 o C. e. 3.0L of He gas at 5.6 atm pressure and 25 o C and 4.5L of Ne gas at 3.6atm and 25 o C are combined at constant temperature of 25 o C into a 9.0L flask. What is the total pressure (in atm) in the 9.0L flask? 2. (10pts) If 26.25mL of a standard 0.1850M NaOH (strong base) solution is required to neutralize 35.0mL of H 2 SO 4 (strong acid), what is the molarity of the acid solution? 3. (10pts) Balance the Following REDOX reaction by the Half Reaction Method.
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Mn 2+ (aq) + BiO 3 - (aq) ------ MnO 4 - (aq) + Bi 3+ (aq) [acidic] 4. (12pts) 21.5mL of a 5.0M hydrochloric acid solution is combined with 7.00g of solid MgCO 3 according to the reaction: 2HCl(aq) + MgCO 3 (s) ---------> CO 2 (g) + H 2 O(l) + MgCl 2 (aq) How many liters of CO 2 (g) would be produced by this reaction if the gas is collected at STP? SCANTRON FORM FOR THIS SECTION: EXAM # 222 5. Multiple Choice - Select one answer for each of the following. (38pts/2pts each)
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