Concentration
Units
Units
mol solute/kg solvent
is the equation for what?
Molality
What type of intermolecular force(s) are in liquid N2?
London forces
Identify the phase change term used to describe:
C18H38(s) → C18H38(l)
Melting or Fusion
What does this equation solve for?
π = MRT
Osmotic pressure
What are the 3 possible elements attached to an H that would allow a hydrogen bond?
N, O, F
What is the equation to find the percent by mass?
*Specify Unit
(grams of solute/grams of solution) x 100
Place the following in order from strongest to weakest
- London forces
- Dipole-Dipole
- Hydrogen Bonding
Hydrogen Bonding
Dipole-Dipole
London Forces
What is the term used to describe a liquid turning into a gas?
Vaporization
The addition of a non-volatile, non-electrolyte to a solvent will __________ the osmotic pressure, π, of the solution/solvent.
Increase or Decrease?
Increase
What is the term used to describe:
Solid --> Gas
Sublimation
The solubility of MgSO4 in water at 0C is 26g per 100.0g of water. What is this solubility in molality?
Molar mass
MgSO4 120. 367 g/mol
2.2m
Van der Waals (London Forces) act between ALL atoms and molecules, even those with permanent dipoles.
True or False?
TRUE
The mass of sodium acetate that will dissolve in 100 g of water is 130 g at 0°C and 190 g at 100°C.
If 190 g of sodium acetate is placed in 100 g of water at 0°C, how much will dissolve?
130 g
The vapor pressure of ethyl alcohol at 25°C is 90.7 torr. Calculate the vapor pressure of the ethyl alcohol in solution at 25°C if 0.300 mol glucose is dissolved in 0.980 mol of the alcohol.
69.39 torr
As intermolecular forces between molecules increase, the apparent surface tension will ______
Increase/ Decrease
Increase
What is the mole fraction NaCl in a salt and water solution that is 22% NaCl by mass?
Molar Mass:
NaCl 58.443g/mol
H2O 18.014g/mol
0.080
What is the strongest intermolecular force in the following compound?
CH3CH2CH2CH2OH
Hydrogen Bonding
Which solvent C6H6 or H20 is most likely to dissolve methyl alcohol, CH3OH?
H2O
Polar Solvent
"like dissolves like"
Calculate the freezing point of a solution containing 0.200 mol of a nonelectrolyte solute in 4.50 kg of benzene? The value of Kf for benzene is found to be 5.12°C/m and
Tf ° value to be 5.5°C.
5.275 °C
An ionic solid will have a ______ melting point
Low, Variable, High to very high, or Very high
High to very high
Two chemists are in a heated argument over whose solution has a higher molality of chloride ions. The first chemist made his solution using 6.75 g of AlCl3 in 195 g of water. The second chemist made his solution using 5.55 g of AlCl3 in 125 g of water. Which chemist wins the argument?
AlCl3 133.34g/mol
Chemist 2 with a molality of 0.33m
Order the following compounds by strength of their intermolecular forces, from weakest to strongest:
H2O, CH4, C2H6, HBr
CH4, C2H6, HBr, H2O
The vapor pressure of diethyl ether is 300 mmHg at 18°C, and its molar heat of vaporization is 26 kJ/mol. Calculate its vapor pressure at 32°C.
(R = 8.31 J/ K.mol)
491.8 mmHg
What is the molar mass (MM) of a non-dissociating, non-electrolyte substance if 3.84 g of the substance in 500.0g g of benzene, C6H6 (formula wt. = 78 g/mole) gives a freezing point depression of 0.307 C.
Kf= 1.86 C/m
46.5 g/mol
Intermolecular forces play a large role in many of the physical properties of liquids and gases. These include:
(There are 4)
vapor pressure
boiling point
surface tension
viscosity