Phase Changes

Question 1

What are the 6 phase changes?

Answer 1

1. Melting
2. Vaporization
3. Deposition
4. Freezing
5. Condensation
6. Sublimation

Question 2

What does a positive slope on a phase diagram indicate?

A negative one?

Answer 2

The solid is more dense than the liquid.

Vice versa

Question 3

As pressure goes up, what happens?

Answer 3

Equilibrium favors the more dense phase (think ice skating)

Question 4

What are the molecular forces from strongest to weakest?

Answer 4

Intramolecular forces
Hydrogen bonds
Dipole-dipole forces
London dispersion forces

Question 5

As molecular mass increases, what happens to London dispersion forces?

Answer 5

They increase

Question 6

What difference in molar mass is required for a nonpolar substance to have a higher boiling point than a polar substance? (Not precise)

Answer 6

Several hundred g/mol

Question 7

What four properties of liquids can be attributed to intermolecular forces?

Answer 7

1. Beading
2. Surface tension
3. Capillary action
4. Viscosity

Question 8

What are the two types of solids?

Answer 8

1. Amorphous

2. Crystalline

Question 9

What is the crystal lattice?

Answer 9

3D grid that a crystal solid aligns to

Question 10

What is a unit cell?

Answer 10

The smallest repeating 3D pattern in a crystal lattice