As always… OWL Lon-Capa assignments Lecture videos Textbook Read Do text homework

Intermolecular Forces (IMFs)

Clicker Question Identify the strongest intermolecular force for the given molecule C2H6 NH3 CH3OCH3 a) LDF H-bond H-bond b) dipole-dipole LDF dipole-dipole c) H-bond H-bond dipole-dipole d) LDF dipole-dipole dipole-dipole e) LDF H-bond dipole-dipole

Clicker Question Methane (CH4) is a gas, but carbon tetrachloride (CCl4) is a liquid at room conditions. Which of the following explains this phenomenon? a) CCl4 is a polar molecule and CH4 is not. b) CCl4 and CH4 have different geometries and shapes. c) CH4 exhibits hydrogen bonding and CCl4 does not. d) Cl is more electronegative than H. e) None of the above explanations explains this.

Clicker Question Consider 1.0 mol samples of the following gases at STP (0C, 1 atm): CO, He, SO2, and N2. Arrange the gases from most ideal behavior to least ideal behavior. most ideal least ideal a) N2 He SO2 CO b) N2 He CO SO2 c) He N2 SO2 CO d) He CO N2 SO2 e) He N2 CO SO2

Clicker Question When table salt (solid NaCl) is dissolved in water, the overall process is slightly endothermic (the change in enthalpy is 4 kJ/mol). The lattice energy for NaCl is –787 kJ/mol. Determine the enthalpy of hydration.   a) –783 kJ/mol b) –791 kJ/mol c) 783 kJ/mol d) 791 kJ/mol e) 4 kJ/mol