Announcements Be respectful – no electronics please! Exam 3 is on Thursday December 6 at 7:00 pm! (Conflict at 5:00 pm, sign up in 1026 Chem Annex before NOON Thurs) No calculators allowed Exam room locations posted online Optional review lecture on Thursday Exam 3 Review Questions due tomorrow at 10 pm Last Lon-Capa HW due tomorrow at 10 pm NO Discussion on Friday Graded exams returned in lab on Monday the 10th Last Pre-lecture assignment due Tuesday Dec 11th at 8 am 101A final exam is Friday December 14th at 8 am Please complete ICES Forms!

Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure Molecular Properties

Clicker #1 Is methane (CH4) expected to dissolve in H2O? A) Yes – Both are polar. B) Yes – CH4 is nonpolar and H2O is polar. C) Yes – Both are nonpolar. D) No – Both are nonpolar. E) No - CH4 is nonpolar and H2O is polar.

Clicker #2 Determine the strongest intermolecular force present between molecules of each of the following substances. Which molecule has the strongest intermolecular forces overall? A) CH2O B) H2 C) HF D) Impossible to tell

Clicker #3 What are the strongest intermolecular forces between molecules of sucrose (C12H22O11) and NaCl? One sucrose molecule is pictured. NaCl C12H22O11 a) Dipole-dipole Hydrogen bonding b) London dispersion c) Ion-ion d)

Clicker #4 Which has the highest melting point? A) C12H22O11 B) NaCl C) Impossible to tell

Clicker #5 Which will dissolve in water? A) C12H22O11 B) NaCl C) Both NaCl and C12H22O11 D) Neither NaCl nor C12H22O11 E) Impossible to tell

Clicker #6 Which has the highest boiling point? A) CH4 B) CH3CH3 C) CH3CH2CH3 D) All the same E) Impossible to tell