30 - Topics for the day Administrative stuff Intermolecular...

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Topics for the day Administrative stuff Intermolecular forces Ion-ion forces Ion-dipole forces Dipole-dipole forces Dispersion forces Hydrogen bonds Administrative stuff Homework Quest HW4 due Friday 10 am (4/9) ALEKS objective 5 due a week from today (10 am, 4/12) ALEKS prep assessment scores not updated yet sorry. Revision topics in ALEKS Obj 5 Writing net ionic equations (Section 4.6) More Precipitation – limiting reactants (Section 4.8) Quest signi±cant ±gures From the student FAQ: The computer carries out all calculations to at least six sig ±gs. Do not round off intermediate calculations or your ±nal answer. To be counted as correct, your answer must be within 1% of the computer’s answer, except for an answer of zero which must be exact. 1 2 3

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Where were we? The van der Waals equation is a modifcation oF the ideal gas law that takes into account the attraction and repulsion between gas molecules and the volume oF the molecules themselves. p + (V – nb) = nRT an 2 V 2 Combining this with the defnition oF the compression Factor, we can show that For Z < 1, attractive Forces dominate and For Z > 1, repulsive Forces dominate. When the properties oF liquids and solids are compared to the properties oF gases, we see that the two condensed phases — liquid and solid — are more similar to each other than they are to gases. A. a gas at high temperature B. a gas at low density C. a noble gas D. a gas at high pressure E. a gas in a large container iClicker Time Which oF the Following gases is most likely to deviate From ideal gas behaviour? Gases behave ideally when the molecules are far apart. high T low n high V low p A. attractive Forces B. repulsive Forces C. gravitational Forces D. compression Forces E. expansion Forces iClicker Time IF a real gas has a volume larger than you’d predict based on the ideal gas law For a given set oF conditions, then the intermolecular interactions For that gas are dominated by Z = pV nRT If V is larger than the ideal gas law predicts, then Z is larger than the ideal gas law predicts. Z > 1 When Z >1, repulsive interactions dominate 4 5 6
Intermolecular Forces Intramolecular forces are the forces that hold atoms together to form molecules. We’ve talked about two different intramolecular forces: Ionic Bonding Between individual ions; e.g., between Mg 2+ and O 2– to make MgO Covalent Bonding Between individual atoms in a molecule or polyatomic ion; e.g., between C and O to make CO 2 or between S and O to make SO 4 2– Intermolecular forces are the forces that hold atoms or molecules together to form condensed phases. There are three types of intermolecular forces:

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30 - Topics for the day Administrative stuff Intermolecular...

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