Blake Lecture 12-1-08 - Blake Chemistry EX 1 Which has the...

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Blake 12-1-08 Chemistry EX 1: Which has the highest boiling point? 1. Fluorine 2. Bromine 3. Iodine - ANSWER Which intermolecular force(s) Most? Least? Because it’s solid, greater intermolecular forces All nonpolar LARGER MOLECULES HAVE GREATER VAN DER WAALS FORCES EX 2: What is the strongest intermolecular force in H 2 ? 1. London dispersion forces (nonpolar) - ANSWER 2. Dipole-dipole forces (Needs to be polar) 3. Ion-dipole forces (needs to be an ion) 4. Hydrogen bonds (Needs to bond to either N, O, F with a loan pair and the H’s) NH 3 , H 2 O, HF Needs to be bonded w/ NOF and have a loan pair The hydrogen has to be polar Colligative Properties Boiling Point Elevation EX 3: What is the boiling point of an aqueous solution if 2.3 mol of sodium sulfate is dissolved in 500 g of water? Kb is 0.53 C/m 1. M Na 2 SO 4 = 2.3 mole of Na 2 SO 4 / 0.5 kg of Water = 4.6 m Na 2 SO 4 2. 1Na 2 SO 4 = 2Na + + SO 4 2- 3. 4.6 m 9.6 m 4.6 m 4. 4.6 m Na 2 SO 4 * 2 Na + = 5. 13.8 m total ions 6. Change in BP = 0.53 C/m * 13.8 total m = +7.3 C 7. Final Boiling Point = 100 C (normal bp) + 7.3 C = 107.3 C Freezing Point Depression
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Any Questions? Shape of an atomic orbital relates to S = circle, P = Dumbbell, D = Double
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