University:
Boston University
Course:
CAS CH 101 | General Chemistry 1
Academic year:

2021
Views:

180

Pages:

4
Author:

loambiguop04d

TP The correct order of polarity of HBr, HCl and HI is least to most … 17% 17% 17% 17% 17% 17% 1. 2. 3. 4. 5. 6. HBr HCl HBr HI HCl HBr HCl HI HI HCl HI HBr HI HCl HI HBr HBr HCl Dipole can be attractive or repulsive For today … • Complete: Dipole‐dipole vs. temporary dipole dispersion • Putting it all together: Relative boiling points Next lecture: Practice: Intermolecular forces; Dissolving ionic solids; solubility rules; Precipitation reactions; concentrations after precipitation; ionization of molecular solutes; self‐ ionization of water Dispersion forces are due to induced dipoles 1 Induced dipoles Dispersion always attractive Sketch the induced dipole in each case: Relative boiling points Putting it all together: Relative boiling points Boiling means particles overcome attraction to their neighbors and depart the liquid. Relative boiling points reflect relative strength of intermolecular forces … Dispersion Dipole‐dipole interaction Hydrogen bonding 2 Relative boiling points (fig 6.20, p 172) Why is SnH4 SbH3 Why is SnH4 < SbH3 < TeH2? TeH2? Why is CH4 SiH4 GeH4 Why is HCl HBr HI? Why is NH3 PH3 AsH3 Why is OH2 FH Why is CH4 < SiH4 < GeH4 < SnH4? SnH4? SbH3? NH3? TP The correct order of polarity of HBr, HCl and HI is least to most … 0% 0% 0% 0% 0% 0% 1. 2. 3. 4. 5. 6. HBr HCl HBr HI HCl HBr HCl HI HI HCl HI HBr HI HCl HI HBr HBr HCl 3 TP The correct order of boiling point of HBr, HCl and HI is lowest to highest … 17% 17% 17% 17% 17% 17% 1. 2. 3. 4. 5. 6. HBr HCl HBr HI HCl HBr HCl HI HI HCl HI HBr Why is HCl < HBr < HI? HI HCl HI HBr HBr HCl Dipole can be attractive or repulsive Dispersion always attractive 4