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Unit 3: Kinetic Molecular Theory and States of Matter

Unit 3: Kinetic Molecular Theory and States of Matter. Intermolecular Forces and Liquids, Day 3. Objectives: 1. Define vaporization and calculate ∆ vap H 2. Define vapor pressure and analyze vapor pressure curves. 3. Define boiling point.

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Unit 3: Kinetic Molecular Theory and States of Matter

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  1. Unit 3: Kinetic Molecular Theory and States of Matter Intermolecular Forces and Liquids, Day 3 Objectives: 1. Define vaporization and calculate ∆vapH 2. Define vapor pressure and analyze vapor pressure curves. 3. Define boiling point

  2. Intermolecular Forces and Liquids, Day 3 Vaporization and Condensation: Definitions, ∆vapH, heat transfers You put 925 mL of water into a pan at 100oC and slowly evaporate all the water. How much energy must have been transferred to vaporize the water? ∆vapH water =40.7 kJ/mol

  3. Intermolecular Forces and Liquids, Day 3 Vapor Pressure: Definitions, equilibrium, relationship to temperature

  4. Intermolecular Forces and Liquids, Day 3 Are the liquid particles moving?

  5. Intermolecular Forces and Liquids, Day 3 what about the Fastest particles That are at the Surface?

  6. Intermolecular Forces and Liquids, Day 3 Where does the Water vapor go?

  7. Intermolecular Forces and Liquids, Day 3 Are the liquid particles still vaporizing?

  8. Intermolecular Forces and Liquids, Day 3 At 25oC : Will the particles Vaporize until The liquid is gone?

  9. Intermolecular Forces and Liquids, Day 3 At 25oC : When does the vaporization stop?

  10. Intermolecular Forces and Liquids, Day 3 At 25oC : When eqm occurs What is the pressure Exerted by h2o vapor?

  11. Intermolecular Forces and Liquids, Day 3 At 25oC : When eqm occurs What is the total Pressure inside?

  12. Intermolecular Forces and Liquids, Day 3 At 75oC : What happens To the liquid Particles?

  13. Intermolecular Forces and Liquids, Day 3 At 75oC : So what will Happen to the Vapor pressure?

  14. Intermolecular Forces and Liquids, Day 3 At 75oC : Still assuming a Pair=1 atm, what Is the ptot inside?

  15. Intermolecular Forces and Liquids, Day 3 At 100oC : What special Phase change Is now happening?

  16. Intermolecular Forces and Liquids, Day 3 Vapor Pressure: Definitions, equliibrium, relationship to temperature What is the vapor pressure of water at 75oC? Are liquid and vapor in equilibrium when the temperature is 100oC and the pressure is 0.5 atm? What is happening at this point?

  17. Intermolecular Forces and Liquids, Day 3 Boiling Point: Normal boiling point, altitudes

  18. A. Decide the intermolecular forces that would be present in each of the following: I. a) Liquid methane b) mixture of water/methanol c) Solution of bromine in water II. a) Ethanol b) copper(II) sulfate in water c) Iodine in ethanol III. a) Hexane (liquid at 25oC) b) solid iodine at 25oC c) Methane gas at 25oC B. Describe a mixture of I2(s), CCl4 and water. (Electronegativities: C=2.5 and Cl=3.0) C. What IM forces exist between CCl4 and hexane? (Electronegativities: C=2.5 and Cl=3.0) D. What IM forces are involved in liquid O2, liquid CH3OH and N2 dissolved in H2O? Rank them.

  19. Intermolecular Forces and Liquids, Day 3 Sample AP Question: In which of the following molecules is H-bonding the most significant intermolecular force and why? CH4 C5H11OH C6H13NH2 CH3OH CO2 Which would you expect to have the highest boiling point?

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