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9-16-08[lecture5]ht - Chem 116 Lecture 5 Class Notes[HT...

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Chem 116, Lecture 5 Class Notes [HT] iClicker Question: Which answer represents a list in order of increasing deviation from ideal gas behavior? **Key points of Deviation from Ideal Gas Behavior** - The greater the deviation the less ideal the gas is. - The deviation from ideal behavior is large at high pressure. - Low pressure = more ideal (less deviation) - As temperature increases the deviation from ideal behavior decreases. - As temperature decreases the deviation increases. (Maximum deviation near the temperature at which the gas becomes a liquid (at point of phase change known as the “critical point”). - Ideal gas particles occupy very little space and have no attraction forces. - Van der Waals equation used to predict gas behavior: P = (nRT/ V - nb) – (n 2 a/ V 2 ) A) a. N 2 at 25 o C and 1 atm, b. N 2 at 25 o C and 1 atm, c. N 2 at 25 o C and 4 atm Note: a Æ b: higher temperature, molecules moving faster so volume increasing. b Æ c: increase of pressure. (c is less ideal than a.) Not in correct order!
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