Unit 4 Solids, Liquids, and Attractive Forces

Day 1: IMF Problem Set, Like Dissolves Like

Day 2: Chromatography Lab

Day 3: Vapor Pressure Problem Set, Gas Collection Over Water

Day 4: Phase Diagrams Problem Set

Day 5: Liquid-Gas Equilibria

Day 6: Discussion of Distillation (Simply v. Fractional), Network Covalent and Metallic Solids, Alloys POGIL

Day 7: Periodic Trends and Attractive Forces, Review for Test

Day 8: Review

Day 9: Review

Day 10: Test Day!

Day 0 Notes:

Intermolecular Attractive Forces (Snider’s Video)

intramolecular forces - bonds within a molecule

intermolecular forces - individual molecules put together by attractive forces (between molecules)

2 Types of IMFs

Dipole-Dipole

  • between molecules that possess permanent dipoles (polar)

  • only between polar molecules

  • origin is electrostatic (the attractive or repulsive forces between stationary charged particles due to their electric charges) (Coulomb’s Law)

    • Coulomb’s Law also explains ion-dipole forces, which attract an ion and a polar molecule together

      • strength depends on:

  1. charge/size of ion

  • positive more concentrated

  • positive smaller than negative

  1. size of polar molecule/magnitude of dipole moment

  • larger the dipole, greater force of attraction

1) Hydrogen bonding - special type of dipole-dipole force where polar molecules have a O-H, N-H, or F-H bond

  • H is small, allowing for dipoles to be in close proximity and because FON are so “EN” the bond is highly polarized