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

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
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:
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online