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 Fatty A Acid trans- Unsaturated B Fatty Acid cis- Unsaturated C Fatty Acid

Quiz: Clicker Question The BP of GeH 4 is less than the BP of the H 2 Se 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 The BP of PH 3 is less than the BP of the SbH 3 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 The BP of NH 3 is higher than the BP of the SbH 3 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

INTERMOLECULAR FORCES Between different “types” of compounds Think of examples of the following: Ion – Dipole Dipole – Induced dipole

INTERMOLECULAR FORCES Strength Varies with TYPE

Intermolecular Forces Remember our discussions of gases: Ideal Gas Law Hard Sphere Model Van der Waal’s Equation Attractions are very important!!

Poll: Clicker Question Which compound do you think would deviate most from the ideal gas law? A. H 2 O B. CH 4 C. H 2 D. He

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

Poll: Clicker Question 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.

Demonstration http://ctp.cm.utexas.edu/courses/f2012/ch301/pdfs/VIDEO0016. mp4

Poll: Clicker Question Which do you think has the higher vapor pressure? a) CH 3 CH 2 OH b) CH 3 OCH 3 c) They would be the same

Poll: Clicker Question • Which would you predict would have the higher vapor pressure? A. Water at 25 ⁰ C B. Water at 50 ⁰ C

Vapor Pressure We’ve extensively discussed the relationship between boiling point and IMF. What is the relationship between boiling point and vapor pressure?

Learning Outcomes Relate the IMFs to liquid properties such as boiling point, vapor pressure, viscosity and surface tension

Important Information LM24 LM25 HW Exam 3 NEXT Thursday!