Quiz 1-solutions - Version 004 Quiz 1 fakhreddine (51615)...

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Version 004 – 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 Which one of the following would be expected to boil at the lowest temperature? 1. H 2 O 2. H 2 S correct 3. H 2 Te 4. H 2 Po 5. H 2 Se 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. 002 10.0 points At 75 , the vapor pressure of water, methanol, diethylether and benzene are 289, 1126, 2680, and 644 torr, respectively. Which of these is NOT above its boiling point at normal atmo- spheric pressure? 1. diethylether 2. methanol and diethylether 3. water and benzene correct 4. water 5. methanol, diethylether, and benzene
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This note was uploaded on 05/19/2011 for the course CHEM 51615 taught by Professor Fatima during the Spring '11 term at University of Texas.

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Quiz 1-solutions - Version 004 Quiz 1 fakhreddine (51615)...

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