Exam4A - Practice Exam version A Fall 2011 1. A CD player...

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Unformatted text preview: Practice Exam version A Fall 2011 1. A CD player and its battery together do 500 kJ of work. The battery also releases 250 kJ of energy as heat and the CD player releases 50 kJ as heat due to friction from spinning. Assume that the system is the battery and the CD player together. For the system, what are the signs of heat and work? A) q and w are both positive B) q and w are both negative C) q is positive and w is negative D) q is negative and w is positive E) Cannot determine without the internal energy of the system 2. The atomic radius of magnesium is 160 pm. Estimate its density, given that the metal has a face centered cubic close packed structure. A) 1.74 g&cm 3 B) 0.435 g&cm 3 C) 10.5 g&cm 3 D) 4.45 g&cm 3 E) 2.78 g&cm 3 3. A 25.0 g block of metal initially at 95.0 o C is placed in a calorimeter containing 121 g of water initially at 27.2 o C. If the final temperature of the water plus metal is 28.8 o C, then what is the heat capacity of the metal? The heat capacity of water is 4.184 J/g o C. Assume no heat is lost to the calorimeter or the surroundings. A) 2.0 J/gC B) 0.12 J/gC C) 8.4 x 10 2 J/gC D) 0.49 J/gC E) 0.021 J/gC 4. How much heat is released when 32.3 g of Cu is reacted with oxygen? (1/2)O 2 ( g ) + Cu( s ) & CuO( s ) & H o rxn = 156 kJ/mol A) 5.04 & 10 3 kJ B) 156 kJ C) 79.3 kJ D) 63.4 kJ E) 307 kJ Practice Exam version A Fall 2011 5. Consider the following numbered processes: A 2B H 1 B C + D H 2 E 2D H 3 What is H for the reaction A 2C + E? A) H 1 + H 2 + H 3 B) H 1 + H 2 C) H 1 + H 2 H 3 D) H 1 + 2 H 2 H 3 E) H 1 + 2 H 2 + H 3 6. The mass of a face-centered cubic unit cell is A) two times the mass of one atom. two times the mass of one atom....
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This note was uploaded on 01/16/2012 for the course CHEM 1211 taught by Professor Ford during the Fall '09 term at Georgia Institute of Technology.

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Exam4A - Practice Exam version A Fall 2011 1. A CD player...

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