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HW6 - momin(rrm497 Homework 6 Sutclie(53120 This print-out...

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momin (rrm497) – Homework 6 – Sutcliffe – (53120) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The correct name for HBrO 3 (aq) is 1. hydrobromic acid. 2. perbromic acid. 3. bromous acid. 4. bromic acid. correct Explanation: HBrO 3 is brom ic acid. Brom ous acid has one fewer oxygen atom than the “-ic” acid HBrO 2 . Per brom ic acid has one more oxygen atom than the “-ic” acid and has the formula HBrO 4 . Hydro bromic acid is an aqueous so- lution of hydrogen bromide (HBr). 002 10.0 points Which of these compounds would you expect to be a weak electrolyte? 1. All of these compounds are strong elec- trolytes. correct 2. calcium chloride 3. ammonium phosphate 4. sulfuric acid 5. barium hydroxide Explanation: 003 10.0 points How many grams of CaBr 2 are needed to prepare 4.65 L of a 7.65 M solution? 1. 0.00303 g 2. 122 g 3. 5.26 g 4. 7110 g correct 5. 4270 g 6. 0.178 g Explanation: M = 7 . 65 M V = 4 . 65 L ? g CaBr 2 = 4 . 65 L × 7 . 65 mol CaBr 2 L soln × 200 g CaBr 2 1 mol = 7110 g 004 10.0 points Thomas poured 25 mL of 0.50 M HCl into a large bottle. He then added enough water so that the new (diluted) concentration was 0.10 M HCl. How much water did Thomas add? 1. 25 mL 2. 150 mL 3. 100 mL correct 4. 125 mL 5. 75 mL 6. 50 mL Explanation: M 1 = 0.50 M V 1 = 25 mL M 2 = 0.10 M M 1 V 1 = M 2 V 2 V 2 = M 1 V 1 M 2 = 0 . 5(25 mL) 0 . 1 = 125 mL 125 mL is the FINAL volume of the diluted solution. The starting amount was 25 mL, so Thomas ADDED 100 mL to the 25 mL to get the 125 mL total. 005 10.0 points Predict the products of the reaction
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momin (rrm497) – Homework 6 – Sutcliffe – (53120) 2 HNO 3 (aq) + KCl(aq) . 1. KHCl 2 2. KH, NO 3 Cl 3. ClNO 3 , K 2 O 4. KNO 3 , HCl correct Explanation: This reaction of two soluble compounds in aqueous solution will be a metathesis reac- tion. The positive ion from one compound combines with the negative ion from the other compound and vice-versa. The products will be KNO 3 and HCl, both soluble compounds. 006 10.0 points Identify the spectator ion(s) for this reaction occuring in water: Barium perchlorate and sodium sulfate are mixed to form sodium per- chlorate and barium sulfate. 1. Na + and ClO 4 correct 2. SO 2 4 and Ba 2+ 3. Ba 2+ only 4. Na + , SO 2 4 , Ba 2+ , and ClO 3 5. Na + only 6. Na + and ClO 7. Na + , SO 2 4 , and ClO 4 Explanation: 007 10.0 points At constant temperature, the rate of effusion of H 2 is 1. four times that of oxygen gas. correct 2. None of these 3. one-half that of helium gas.
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