Tutorial 9 - CHEMISTRY 1AA3 March 15-19, 2010 TUTORIAL...

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CHEMISTRY 1AA3 March 15-19, 2010 TUTORIAL PROBLEM SET 9 ______________________________________________________________________________ 1. How does each of the following affect the rate of evaporation of a liquid in an open dish? (a) Intermolecular forces (b) Temperature (c) Surface area 2. When wet laundry is hung on a clothesline on a cold winter day it will freeze but will eventually dry. Explain the observation. 3. Identify the most important types of intermolecular forces present in the following substances. (a) NH 3 (aq) (b) NO (c) BF 3 (d) HF (e) cyclohexane (f) carbon monoxide 4. Indicate which of the following compounds should have the higher melting/ boiling points. Explain your answers. Melting point: (a) octanoic acid (b) E-2-octenoic acid Boiling point: (b) HF and HCl Boiling point: (c) HCl and LiCl Boiling point: (d) n -hexane and n -pentane 5. Label the regions A-H in the phase diagram below. Identify the normal boiling and melting points. (y-axis-pressure, x-axis-temperature)
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Unformatted text preview: CHEMISTRY 1AA3 March 15-19, 2010 TUTORIAL PROBLEM SET 9 ______________________________________________________________________________ Page 2 of 2 6. For the phase diagram for CO 2 (right), what happens to a sample of CO 2 when the following occurs: (a) The temperature is increased from -100 C to 0 C at a constant pressure of 2 atm. (b) The pressure is reduced from 72 atm to 5 atm at a constant temperature of 30 C (which is slightly less than the critical temperature of 31.1 C). (c) The pressure is first increased from 3.5 atm to 76 atm at -10 C and then the temperature is increased such that the CO 2 is subjected to conditions above the critical temperature and pressure. 7. Stinker. Compare the phase diagrams for water (right) and CO 2 (above). What is the significance of the change in slope between the solid-liquid boundary which is positive for CO 2 but negative for water? 8. Review test 2 solutions....
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Tutorial 9 - CHEMISTRY 1AA3 March 15-19, 2010 TUTORIAL...

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