Entry Task: March 23 rd Friday Question: For the following, place the following in increasing order of IMF. C 5 H 12 C 8 H 18 C 3 H 8 You have ~7 minutes
Agenda: Discuss Ch worksheet Notes on Phases- Section 4 HW: Ch. 3 section 4 ws
Intramolecular force Intermolecular force Weak force due to the shifting of electron clouds between molecules/particles
Identical nonpolar molecules When molecule/compound have a permanent positive end and negative end Attraction between molecules whose opposite ends are attracted
Strong IMF between hydrogen and highly EN atoms (FON) with lone pairs of electrons H-Bonding Dispersion Dipole 2 Dispersion, Dipole-dipole, and hydrogen bonding
true tightly Intermolecular
Decreases true More An amorphous
I Can… Section -4 *Explain how energy added or removed to substances can change their phase and Explain a phase diagram.
Write down-
Order Less energy Less order More energy Chaos Most energy Taking in energy (endothermic) Releases energy (exothermic) Taking in energy (endothermic) Releases energy (exothermic) Releases energy (exothermic) Taking in energy (endothermic)
The Energy Sequence Endothermic process- requires energy from surroundings Melting- solid to liquid Vaporization- liquid to gas Sublimation- solid to gas
The Energy Sequence Exothermic process- releases energy to the surroundings Freezing- liquid to solid Condensation- gas to liquid Deposition- gas to solid
Solid Liquid Gas Melting Freezing Vaporization Condensation Sublimation Deposition Triple point Critical Point
Click in white area- Phase diagram movie
What do they mean? Border lines- show temp/pressure when 2 phases can coexist. Triple point- temp/pressure at which 3 phases can coexist. Critical point- temp/pressure which water cannot exist as a liquid anymore.
Homework: Backside of notes- Interpreting phase diagrams & Ch worksheet