Chem%20111%20Midterm%202%202009

Chem%20111%20Midterm%202%202009 - 1 Chemistry 111 - Section...

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1 Chemistry 111 - Section 101 Midterm Test #2– 23 October 2009 Name _______________________ Lab ________ Bench_________ Avogadro’s number = N A = 6.022 x 10 23 mol -1 Gas Constant: R = 0.0821 L atm mol -1 K -1 Kelvin = °C + 273.15 1 atm = 760 torr Question 1. Dry Ice (solid CO 2 ) has occasionally used as an explosive in mining. A hole is drilled, dry ice and a small amount of gunpowder is added, a fuse is added and the hole is plugged. When lit the exploding gunpowder rapidly vaporizes the dry ice, building up tremendous pressure to split the rock. Assume that 500.0 g of dry ice is placed in a cavity with a volume of 0.800L and the gunpowder heats the CO 2 to 700K, What is the final pressure in the hole?(8 marks) Question 2.(8 marks) (a) Balance the following reaction using the half-reaction method MnO 4 - + Br - Mn 2+ + Br 2 (b) Which is the oxidizing agent and which is the reducing agent in the reaction Oxidizing Agent = ____________________________ Reducing Agent = ____________________________
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This note was uploaded on 05/19/2011 for the course CHEM CHEM 111 taught by Professor Wassell during the Winter '09 term at UBC.

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Chem%20111%20Midterm%202%202009 - 1 Chemistry 111 - Section...

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