Unit 5: Intermolecular Forces

Phase Diagrams

100

Which phase of matter is typically found at low temperatures and high pressures?

Solid

200

This phase of matter is described to have an indefinite shape and an indefinite volume.

Gas

300

If you see "normal freezing point," what pressure should you automatically look for on a phase diagram?

1 atm

400

True or False: A freezing point for a certain substance could be 100 degrees Celsius.

True

500

Looking at a phase diagram from left to right...what is the order of phases?

**Double Jeopardy**

Solid, liquid, gas

Heating/Cooling Curves

100

In which direction does a heating curve point? (Up or down)

Up

200

On a heating/cooling curve...where does kinetic energy remain the same, but potential energy is increasing?

Flat lines

300

On a heating/cooling curve...where does potential energy remain the same, but kinetic energy increases?

Diagonals

400

(1) Where are the phases listed on a heating/cooling curve?

(2) Where are the phase changes listed on a heating/cooling curve?

(1) Diagonals

(2) Flat lines

500

(1) When looking at a cooling curve...what phases AND phase changes should be present?

(2) When looking at a heating curve...what phases AND phase changes should be present?

(1) gas, condensation, liquid, freezing, solid

(2) solid, melting, liquid, evaporation, gas

Polarity

100

Non-polar molecules are said to have equal/unequal sharing amongst atoms?

Equal

200

Is CCl4 polar or nonpolar?

(I will draw out the molecule for you)

Non-polar

300

Is H2S polar or non-polar?

(I will draw the molecule out for you)

Polar

400

Is C2H6O a polar or non-polar molecule?

(I will draw the molecule out for you)

Polar

500

What two characteristics attribute to a molecule being considered polar?

**Double Jeopardy**

1) Different atoms attached to the central atom

OR

2) Lone pairs of electrons on the central atom

IMF's

100

What is another name for London Dispersion Forces?

van der Waals Forces

200

True or False: Dipole-Dipole Forces occur in non-polar molecules.

False

300

van der Waals forces occur between what type of molecules?

Non-polar

Noble Gasses 

400

Hydrogen Bonding occurs between Hydrogen and which 3 elements?

Nitrogen, Oxygen, and Flourine

500

Hydrogen bonding is the strongest IMF, however which Hydrogen bond is the STRONGEST of them all?

H-F

Wildcard

100

Name the phase change: Solid --> Liquid

Melting

200

Hydrogen Bonding is the strongest between which of the following molecules?

(a) H2Se                     (c) H2S

(b) H2Te                     (d) H2O

(d) H2O

300

Which IMF is attributed to result in high boiling points?

Hydrogen Bonding

400

Name the phase change: Gas --> Solid

Deposition

500

Name the phase change: Solid --> Gas

Sublimation