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Gas, Liquid or Solid? UNIT 3 Day 9 What are we going to learn - - PowerPoint PPT Presentation
Gas, Liquid or Solid? UNIT 3 Day 9 What are we going to learn - - PowerPoint PPT Presentation
Sparks CH301 WHY IS EVERYTHING SO DIFFERENT? Gas, Liquid or Solid? UNIT 3 Day 9 What are we going to learn today? Properties of Liquids in context of IMF Quiz: Clicker Question Which of the following has a lower boiling point? Saturated
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A B Which of the following has a lower boiling point?
Saturated Fatty Acid trans- Unsaturated Fatty Acid
C
cis- Unsaturated Fatty Acid
Quiz: Clicker Question
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The BP of GeH4 is less than the BP of the H2Se because: a) The Ge compound has a larger dipole b) The Ge compound has a smaller dipole c) The Ge compound is more polarizable d) The Ge compound is less polarizable e) The Ge compound has more H bonding
Quiz: Clicker Question
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The BP of PH3 is less than the BP of the SbH3 because: a) The P compound has a larger dipole b) The P compound has a smaller dipole c) The P compound is more polarizable d) The P compound is less polarizable e) The P compound has more hydrogen bonding
Quiz: Clicker Question
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The BP of NH3 is higher than the BP of the SbH3 because: a) The N compound has a larger dipole b) The N compound has a smaller dipole c) The N compound is more polarizable d) The N compound is less polarizable e) The N compound has more hydrogen bonding
Quiz: Clicker Question
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INTERMOLECULAR FORCES Between different “types” of compounds
Think of examples of the following: Ion – Dipole Dipole – Induced dipole
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INTERMOLECULAR FORCES Strength Varies with TYPE
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Remember our discussions of gases:
Attractions are very important!!
Intermolecular Forces
Ideal Gas Law Hard Sphere Model Van der Waal’s Equation
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Which compound do you think would deviate most from the ideal gas law?
- A. H2O
- B. CH4
- C. H2
- D. He
Poll: Clicker Question
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Properties of Liquids
What is Vapor Pressure?
http://www.youtube.com/watch?v=re9r0kzQp_M&feature=mfu_in_order&list=UL
Vapor Pressure is Not Boiling
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Which would have the highest vapor pressure? All contain water at the same T.
A B C
- D. Containers A and B have the same VP and are higher than
the VP in container C.
- E. All have the same VP.
Poll: Clicker Question
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Demonstration
http://ctp.cm.utexas.edu/courses/f2012/ch301/pdfs/VIDEO0016. mp4
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Which do you think has the higher vapor pressure? a) CH3CH2OH b) CH3OCH3 c) They would be the same
Poll: Clicker Question
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- Which would you predict would have the
higher vapor pressure?
- A. Water at 25⁰C
- B. Water at 50⁰C
Poll: Clicker Question
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We’ve extensively discussed the relationship between boiling point and IMF. What is the relationship between boiling point and vapor pressure?
Vapor Pressure
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Relate the IMFs to liquid properties such as boiling point, vapor pressure, viscosity and surface tension
Learning Outcomes
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