practice_midterm1_d

Practice_midterm1_d - THIS EXAM DOES NOT NECESSARILY REPRESENT THE LAYOUT OR QUESTIONS FOUND ON EXAM I USE IT ONLY AS A GUIDE FOR STUDYING Part A

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THIS EXAM DOES NOT NECESSARILY REPRESENT THE LAYOUT OR QUESTIONS FOUND ON EXAM I. USE IT ONLY AS A GUIDE FOR STUDYING. Part A : Multiple Choice – Concepts and Calculations. Write the correct answer in the space provided on the first page. No partial credit will be given. 1. The enthalpy of vaporization at 298 K for diethylether is 26.0 kJ/mol. How much heat would be required to vaporize 1.00 L of the ether at 298 K if its density is 0.714 g/L? a. 440 J b. 250 J c. 186 J d. 130 J e. 74.1 J 2. Liquid and vapor phases of a substance become indistinguishable at the: a. triple point b. normal point c. pressure point d. critical point e. soongwae point 3. Ethanol (C 2 H 5 OH) has a normal boiling point of 78.3 ºC and, with H vap = 39.3 kJ/mol. What is the vapor pressure of ethanol at 50.0 ºC? a. 118 torr b. 234 torr c. 354 torr d. 485 torr e. 670 torr 4. If one compares compound A composed of nonpolar molecules with compound B composed of polar molecules, and both molecules have the same molecular formula then it is true that: a. both compounds have the same boiling point b. A boils at a lower temperature than B c. B will not boil d. B boils at a lower temperature than A 5. Which combination of "type of solid" and specific example is incorrect? a. ionic/"table salt" b. metallic/copper wire c. molecular/"dry ice" d. network covalent/magnesium iodide e. network covalent/silicon carbide 6. An arrangement in which every other layer is identical (ABABABAB) is: a. octahedral holes b. tetrahedral holes c. hexagonal close packed
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This note was uploaded on 10/03/2010 for the course CHE2C 929102 taught by Professor Carter during the Spring '10 term at UC Davis.

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Practice_midterm1_d - THIS EXAM DOES NOT NECESSARILY REPRESENT THE LAYOUT OR QUESTIONS FOUND ON EXAM I USE IT ONLY AS A GUIDE FOR STUDYING Part A

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