HC Unit 10 (Ch 14) Review

Categorize the densities of solids liquids and gases

Groups:

(a) More Dense

,

(b) Less Dense

• Liquid

• Gas

• Solid

Categorize the compressibility of solids liquids and gases

Groups:

(a) Not Compressible

,

(b) Compressible

• Gas

• Liquid

• Solid

Categorize the characteristics of water

Groups:

(a) Water

,

(b) Not Water

• colorless

• tasteless

• boils at 100°C

• bluish color

• boils at 100 K

• freezes at 0°C

• acidic taste

• chlorine smell

• freezes at 0 K

• odorless

Which is greater?

(if moles and pressure are constant)

• energy needed to boil water

• energy needed to melt ice

Choose which would be 'changes in state'.

• liquid to gas

• gas to solid

• solid to liquid

• atom to molecule

• low pressure gas to

  high pressure gas

In order to melt or vaporize a substance, which forces might need to be overcome?

• London dispersion forces

• Dipole-Dipole forces

• Hydrogen bonding

• Covalent bonding

• Ionic Bonding

The forces that must be overcome to vaporize a liquid are

• Intermolecular

• Intramolecular

Define molar heat of fusion and molar heat of vaporization. Choose the correct option.

• Molar heat of fusion is the energy per mole required to change a substance from solid to liquid at constant temperature, and molar heat of vaporization is the energy per mole required to change it from liquid to gas at constant temperature.

• Molar heat of fusion is the energy per mole required to raise the temperature of a solid, and molar heat of vaporization is the energy per mole required to vaporize a gas.

• Molar heat of fusion and vaporization both refer to the energy changes during chemical reactions.

• Molar heat of fusion is the energy released during solidification, and molar heat of vaporization is the energy absorbed during condensation.

The heat of fusion of aluminum is 3.95 kJ/g. Determine the molar heat of fusion of aluminum, given its molar mass is approximately 26.98 g/mol.

• 107 kJ/mol

• 96.5 kJ/mol

• 30.93 kJ/mol

• 6.83 kJ/mol

Although London forces exist among all molecules, for what type of molecule are they the only major intermolecular force?

• Nonpolar molecules

• Polar molecules

• Covalent molecules

• Ionic molecules

• Metals