Chapter 11

Question 1

What are the three types of van der Waals forces?

Answer 1

Dipole/Dipole, Hydrogen, London Dispersal

Question 2

What are Dipole/Dipole interactions caused by?

Answer 2

Polarity

Question 3

What are Hydrogen Bonds caused by?

Answer 3

The single electron of a H atom is pulled away by N, O, F, or Cl causing it’s proton to be exposed

Question 4

What are London Dispersal Forces caused by?

Answer 4

Instantaneous/Induced Dipole

Question 5

Of the three van der Waals forces, which is the strongest?

Answer 5

Hydrogen Bonding

Question 6

If the size/shape of two molecules are comparable, what intermolecular bonds are usually dominant?

Answer 6

Dipole-Dipole bonds

Question 7

If the size/shape of two molecules are very different, what intermolecular bonds are usually dominant?

Answer 7

London Dispersal Forces

Question 8

Boiling point is _____________ proportional to the amount of intermolecular forces present

Answer 8

Directly

Question 9

Viscosity and surface tension both ______________ with increased intermolecular attraction

Answer 9

Increase

Question 10

Vapor pressure is ________________ proportional to the amount of intermolecular attractions present

Answer 10

inversely

Question 11

Vapor pressure is ______________ proportional to temperature

Answer 11

Directly

Question 12

When a material enters a “liquid crystal state”, what is known about it’s molecular structure?

Answer 12

The positional nature is lost, while the orientation is retained

Question 13

Nemantic liquid crystals are organized…

Answer 13

along their long axis

Question 14

Smetic A liquid crystals are organized…

Answer 14

in layers, oriented vertically

Question 15

Smetic B liquid crystals are organized…

Answer 15

in layers, oriented diagonally

Question 16

What is different about the position of a metal’s valence electrons?

Answer 16

They are fully dissociated throughout the metal