Entry Task: March 23rd Friday

Question:For the following, place the following in

increasing order of IMF.C5H12

C8H18

C3H8

You have ~7 minutes

Agenda:

• Discuss Ch. 13.2-13.3 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 Dipole2

Dispersion, Dipole-dipole, and hydrogen bonding

true

true

tightlyIntermolecular

Decreases

true

true

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-

Write down-

OrderLess

energy

Less orderMore

energy

ChaosMost

energy

Taking in energy (endothermic)

Releases energy (exothermic)

Taking in energy

(endothermic)

Releases energy

(exothermic)

Relea

ses en

ergy

(exo

ther

mic)

Taki

ng in

ene

rgy

(end

othe

rmic)

The Energy Sequence• Endothermic process- requires energy from surroundings

Melting- solid to liquidVaporization- liquid to gasSublimation- solid to gas

The Energy Sequence• Exothermic process- releases energy to the surroundings

Freezing- liquid to solidCondensation- 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. 13.4 worksheet