chem quiz1 - Version 006 Quiz 1 fakhreddine (51615) This...

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Version 006 – Quiz 1 – fakhreddine – (51615) 1 This print-out should have 4 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices before answering. 001 10.0 points At 25 C and 0.5 atm, which has the highest vapor pressure in a closed 3 liter container? 1. 2.99 liters of water 2. 2 liters of water 3. 2.5 liters of water 4. They all have the same vapor pressure. correct Explanation: 002 10.0 points Which one of the following would be expected to boil at the lowest temperature? 1. H 2 Te 2. H 2 Se 3. H 2 S correct 4. H 2 Po 5. H 2 O Explanation: Here we’re looking for the weakest inter- molecular forces. Water is very polar. The other choices are all negligibly polar so we have to look at which one has the weakest dispersion forces. Smaller molecule = fewer electrons = weaker dispersion forces. H 2 S boils at the lowest temperature. 003 10.0 points At 75 , the vapor pressure of water, methanol, diethylether and benzene are 289, 1126, 2680,
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This note was uploaded on 03/01/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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chem quiz1 - Version 006 Quiz 1 fakhreddine (51615) This...

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