If the average velocity of SO 2 molecules at 25 C is 02 milesec what is the

If the average velocity of so 2 molecules at 25 c is

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42. If the average velocity of SO2molecules at 25 °C is 0.2 mile/sec., what is the average velocity of CH4molecules in miles/sec. at the same temperature? (A) 0.1 (B) 0.2 (C) 0.4 (D) 0.8 43. Cesium-137 decays spontaneously to emit beta particles and form Barium-137. Its half-life is 30 years. Approximately what length of time will have elapsed before 97% of the Cs-137 in a particular sample will have decomposed? 44. An alpha particle is 45. At standard temperature and pressure, chlorine is
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46. Which has the greatest electrical conductivity at room temperature? (A) pure water (B) 0.010 M aqueous sodium chloride solution. (C) 0.010 M aqueous sucrose solution. (D) pure silver 47. Which substance will react appreciably with water, at room temperature and pressure, to produce hydrogen? 48. How many grams of SO2could be formed if a mixture of 128 g of sulfur and 100 g of oxygen are mixed and ignited? 49. A compound was found to contain 21.6% Mg, 21.4% C, and 57.0% by mass. What is the simplest formula for this compound? 50. Consider the hydrocarbons identified by the numbers 1 through 5 below:
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Which pair of the above compounds are isomers? (A) 1 and 4 (B) 1 and 3 (C) 2 and 4 (D) 2 and 5 51. Consider the reaction at equilibrium: 2 SO2(g) + O2(g) <===> 2 SO3(g) H = -7.8 kcal. Which procedure would result in the formation of more SO2? 52. Formulas of five compunds of element Z are listed below. Which one of them must be incorrect? 53. The oxidation number for sulfur in K2SO3is 54. Given the following bond energies:
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C -- H 414 kJ / mol C -- Cl 339 kJ / mol Cl -- Cl 243 kJ / mol H -- Cl 432 kJ / mol How much energy would be released in the reaction CH4(g) + 2 Cl2(g) ---> CH2Cl2(g) + 2 HCl(g) ? (A) 150 kJ (B) 150 kJ (C) 228 kJ (D) 571 kJ 55. The electron configuration for Mn2+is (A) [Ar] 4s23d3(B) [Ar] 3d5(C) [Ar] 4s13d5(D) [Ar] 4s13d456. The energy of electromagnetic radiation is greater if
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  • Spring '08
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  • Chemistry, pH, Chemical reaction, mm Hg

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