mq1b - Useful information: R = 8.3145 J/molAK, R = 0.08206...

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Useful information: R = 8.3145 J/mol A K, R = 0.08206 L A atm/mol A K, K = °C + 273.15, s liquid water = 4.184 J/g A °C, N A = 6.022 x 10 23 1. (6 pts) Which of the following statements is incorrect ? a) BF 3 has only London forces between neighboring molecules. b) CH 2 F 2 is a polar molecule. c) CH 3 CH 2 OH has hydrogen bonding, London forces and dipole-dipole forces between neighboring molecules. d) The London forces in liquid BrF 5 are stronger than the London forces in liquid SeF 6 . O ' e) The intermolecular forces between neighboring molecules of CH 3 CH 2 are stronger than O ( ' OH those of CH 3 C . ( O - CH 3 2. (6 pts) Which of the following statements is incorrect ? a) Increasing the temperature causes an increase in the vapor pressure of a liquid. b) Increasing the pressure causes a decrease in the boiling point of a liquid. c) The stronger the intermolecular forces between neighboring molecules, the higher the heat of vaporization. d) The weaker the intermolecular forces between neighboring molecules, the greater the vapor pressure. e) Surface tension of a liquid increases with increasing strength of intermolecular forces. 3. (6 pts) Which member of each of the pairs of substances has the lower vapor pressure at a specified temperature? GeBr 4 or CI 4 CH 3 OH or H 2 Te TeCl 2 or SeF 6 a) GeBr 4 , CH 3 OH , TeCl 2 b) CI 4 , H 2 Te , TeCl 2 c) GeBr 4 , H 2 Te , SeF 6 d) CI 4 , CH 3 OH , TeCl 2 e) GeBr 4 , CH 3 OH , SeF 6 (1) 4. (6 pts) Which of the following statements is incorrect ?
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a) Liquid A evaporates faster than liquid B at the same temperature so you can conclude B has stronger intermolecular forces than A. b) ClF 3 has a higher normal boiling point than Kr. O O ** ' c) The viscosity of CH 3 CCH 3 is greater than that of CH 3 C. ( OH d) The heat of vaporization of Br 2 is less than that of I 2 . e) The vapor pressure of C 7 H 16 is greater than that of C 2 H 5 I at the same temperature. 5. (7 pts) Hydrogen peroxide, H 2 O 2 , has a normal melting point of -89°C and a normal boiling point of 152°C. The specific heat of solid H 2 O 2 is 1.97 J/g A °C and that of liquid H 2 O 2 is 2.42 J/g A °C.
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mq1b - Useful information: R = 8.3145 J/molAK, R = 0.08206...

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