Intermolecular Forces
Which IMF
Phase Change
Heating Curves
Phase Diagrams

100

These forces are found between atoms.

Intramolecular forces.

100

N2 (nonpolar)

London Dispersion


100

When a gas becomes  a solid.

Deposition

100

At which number would this substance be in a liquid state?

3

100

Which letter would indicate that the substance in that section of the graph is a solid? 

X


200

The four different types of intermolecular forces.

London Dispersion

Induced Dipole

Dipole - Dipole

Hydrogen Bonding

200

H2O2 (polar)

Hydrogen - Bonding


200

When a liquid becomes a gas.

Evaporation


200

At which number would this substance be melting / freezing?

2

200

At what temperature and pressure would the triple point occur? 

Approx. 0.4 atm and 0 o


300

When there is a separation of charge within a molecule resulting in a slightly negative charge on one side and slightly positive charge on the other side. BONUS: what causes it? 

Dipole

Uneven sharing of electrons

300

HCl (polar) & CH4 (nonpolar)

Induced Dipole

300

When a solid becomes a gas.

Sublimation


300

At which number would this substance be a gas?

5

300

What temperature and pressure does the critical point occur at and describe a substance at that point.

Above 1.0 atm and above 150 o


Substance is indistinguishable from liquid and gas

400

Needed for Hydrogen Bonding

Hydrogen with Oxygen, Nitrogen, or Fluorine

400

HBr (polar)

Dipole - Dipole


400

Which molecule would have a higher boiling point? 

HCl (polar) or HF (polar)

HF - hydrogen bonding forces are stronger than dipole-dipole 

400

What is the temperature of the boiling / condensing point of this substance? 

100 o

400

I have a substance at 0.5 atm and -150 oC if I lower the pressure to 0.1 atm what phase change will occur?

Solid to Gas

Sublimation 

500

Do nonpolar molecules stick together better or worse than polar molecules. 

Nonpolar molecules stick together worse, because their electrons are evenly spread out they don't form dipoles.

500

HF (polar) 

Hydrogen - bonding 

500

List these molecules in order of highest boiling point to lowest boiling point. CH4 (nonpolar) HBr (polar) H2 (nonpolar) 

HBr - highest

CH4 

H2 - lowest

500

As I move from 5 to 1 is the substance gaining energy or losing energy?

Losing

500

If I have a substance at 1.00 atm and 75 oC and I lower the temperature to -75 oC what phase change will occur? 

liquid to solid 

Freezing