To Do 8th HW assignment due Friday, April 15 by 10 pm. Quiz #5 tomorrow. Read Chapter 13 and begin the suggested homework.

Intermolecular Forces (IMFs)

London dispersion forces All molecules exhibit these forces (all molecules have electrons and protons). Due to temporary and induced dipoles. Strongest IMFs for non-polar molecules Examples of non-polar molecules include nitrogen (N2) and methane (CH4).

London Dispersion Forces (LDFs)

Dipole-dipole interactions Polar molecules exhibit these forces. Due to permanent dipoles. Stronger IMFs than LDFs (given similar sized molecules). Examples include hydrogen chloride (HCl) and water (H2O – which exhibits a special kind of dipole-dipole interaction called hydrogen bonding).

Dipole-Dipole Interactions

Hydrogen Bonding in Water

Ion-ion interactions Ionic compounds exhibit these forces. Due to ions. Strongest of the IMFs (given similar sized molecules). Example includes sodium chloride (NaCl).

“Like Dissolves Like”