Exam 2

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Unformatted text preview: Exam 2 Dr. Pu Chem 110, Spring 2006 Name:______________________________ Last First You must show all work for the problems in the space provided. Useful information is provided on page1 and the last two pages. Page 2 3 4 5 total Point Breakdown Pts 30 24 24 22 100 Pts gain ____1) Which of following solution has highest concentration of sulfate ion? (a) 0.1 M K2SO4 (b) 0.2 M Al2(SO4)3 (c) 0.3 M Li2SO4 (d) 0.5 M CuSO4 ____2) 5pts Which of the following gases has the lowest density at STP? (a) O2 (b) H2S (c) N2O (d) CO ____3) The measured P of a van der Waals gas compared to an ideal gas is a) lower, because of the intermolecular forces b) lower, because the gas expand c) higher, because the molecules occupy space d) higher, because of the intermolecular forces ____4) What is the ratio of the diffusion rates of Cl2 and O2? (a) 0.45 (b) 0.69 (c) 0.47 (d) 0.67 ____5) A gas while expanding, absorbs 25 J of heat and does 243 J of work. What is U for the gas? (a)+268 J (b) 268 J (c) + 218 J (d) 218 J _____6) Identify the reducing agent in the following equation: Au(s) + 4H+(aq) + NO3-(aq) + 4Cl-(aq) [AuCl4]-(aq)+ 2H2O + NO(g) (a) Au (b) H+ (c) NO3(d) Cl_____7) Choose the incorrect statement (a) Temperature of two bodies are equal when the average kinetic energies of the two bodies become the same. (b) The heat capacity is the quantity of heat required to change the temperature of the system by one degree (c) The specific heat is the heat capacity for one mole of substance. (d) The law of conservation of energy can be written: qsystem + qsurroundings =0 8) 12pts 100.0g of cupper at 100°C is added to a cup of 22.0°C of water, and the temperature of the final Cu-water mixture is 45.5°C. What is the mass of water? (specific heat of Cu = 0.385 J/g C; specific heat of water = 4.18 J/g C). Name:________________________ 9)24pts Acetylene, C2H2, are obtained by the reaction of calcium carbide with water: CaC2(s) + 2H2O(l) Ca(OH)2(s) + C2H2(g) (a) What volume of acetylene can be obtained from 100g of calcium carbide and 100g of water at 0°C and 1.00atm? (b) What volume result when the temperature is 1...