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Practice Exam 2 Fall 2008 for Students

# Practice Exam 2 Fall 2008 for Students - Version 001...

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Version 001 – Practice Exam 2 – Brodbelt – (90000) 1 This print-out should have 33 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider 2 Al + 6 HCl 2 AlCl 3 + 3 H 2 , the reaction of Al with HCl to produce hy- drogen gas. What is the pressure of H 2 if the hydrogen gas collected occupies 14 L at 300 K and was produced upon reaction of 4 . 5 mol of Al? Assume the yield of the reaction is 65.0 percent. Assume the volume, tempera- ture, moles, and pressure are actually known to three signficant figures. 1. 0.233 atm 2. 8.91 atm 3. 5.28 atm 4. 0.0763 atm 5. 7.72 atm 6. 11.9 atm 002 10.0 points For the reaction 2 HCl + Na 2 CO 3 2 NaCl + H 2 O + CO 2 8.0 moles of CO 2 is collected at STP. What is the volume of CO 2 ? 1. 57.6 L 2. 0.0250 L 3. 22.4 L 4. 179 L 5. 2.80 L 6. 0.357 L 003 10.0 points A 750.0 mL metal bulb is filled with 0.421 g of CH 4 and an unknown mass of NH 3 . If the total pressure in the bulb is 3.77 atm at 315 C, then how much NH 3 is also in the bulb? 1. 14.5 grams 2. 0.00713 grams 3. 0.0323 grams 4. 2.39 grams 5. 0.996 grams 6. 1.17 grams 7. 0.549 grams 004 10.0 points A 6.35 L sample of carbon monoxide is col- lected at 55.0 C and 0.892 atm. What volume will the gas occupy at 1.05 atm and 59.0 C? 1. 4.82 L 2. 6.68 L 3. 1.96 L 4. 6.10 L 5. 5.46 L 005 10.0 points What is the bond angle defined by the oxy- gen, carbon, and one of the hydrogen atoms in formaldehyde (CH 2 O)? 1. 120 2. 90 3. 180

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Version 001 – Practice Exam 2 – Brodbelt – (90000) 2 4. 110 006 10.0 points What is the molcular shape of COCl 2 ?. 1. square planar 2. seesaw 3. trigonal pyramidal 4. tetrahedral 5. trigonal planar 6. octahedral 007 10.0 points NO 2 and SO 2 are some of the most important gases in the atmosphere because 1. they generate ozone which helps re-build the ozone layer. 2. they destroy CO and CO 2 . 3. they serve as a barrier to damaging UV radiation. 4. they emit light which results in blue sky and red sunsets. 5. they are the primary reactants responsi- ble for smog and acid rain. 6. they react to form thunderstorms. 008 10.0 points Consider the compound peroxyacetylni- trate, an eye irritant in smog. O N C O O O O H 3 C Predict the indicated bond angle. 1. 120 2. 90 3. 30 4. 109.5 5. 60 009 10.0 points In an improved version of the gas law, P is replaced by P + n 2 a V 2 . Which of the following would you predict has the largest a ?
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Practice Exam 2 Fall 2008 for Students - Version 001...

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