Intermolecular Forces
- Hydrogen bonding
- dipole-diople
- london dispersion
1. London dispersion
2. Dipole-dipole
3. Hydrogen Bonding
Define if the following is endo or exo
1. Sublimation
2. Condensation
3. Fusion
1. endo
2. exo
3. endo
For molecular solids, how would you categorize their melting and boiling points.
Molecular solids have low melting and low boiling points.
What is the equation for Hsolution?
Hsolute + Hsolute-Hsolvent + Hsolvent
or
Hsolute + Hhydration
What is the formula for Henry's Law
Solutility = kH x Pgas
Rank the following in increasing order.
CO2, F2, NH2CH3
Calculate the amount of heat required to vaporize 2.58kg of water at it's boiling point. (The Hvap at boiling point is 40.7kj/mol)
5833 KJ
Which of the following is TRUE!
A. The solubility of a solid is highly dependent on pressure.
B. The solubility of a solid is highly dependent on temperature.
C. The solubility of a highly dependent on temperature and pressure.
B. The solubility of a solid is highly dependent on temperature.
Which would result in an endothermic Hsolution
A. Hsolute > Hhydration
B. Hsolute is close to Hhydration
C. Hsolute < Hhydration
C. Hsolute < Hhydration
Define saturation state.
cannot dissolve more solute; max is reached
What is the strongest type of intermolecular force present in NH2CH3
Hydrogen Bonding
Define Heat of Vaporization
the amount of heat energy required to vaporize one mole of liquid kj/mole
2 atoms
What mass (in g) of NH3 must be dissolved in 475g of methanol to make a .250g m solution.
2.02g
What are two examples of a volatile liquid?
1. gasoline
2. fingernail polish
Which of the following compounds will be most soluble in ethanol (CH3CH2OH)
A. Acetone (Ch3COCH3)
B. Trimethylamine (N(CH3)3)
C. hexane (CH3CH2CH2CH2CH2CH3)
D. Ethylene Glycol (HOCH2OH)
D. Ethylene Glycol (HOCH2OH)
Determine the vapor pressure (in torr) of a substance at 36C, whose normal boiling point is 84C and has a Hvap of 22.1kj/mol
P = 239torr
Identify the type of solid for a diamond.
A. Molecular solid
B. Ionic solid
C. Nonbonding atomic Solid
D. Networking atomic Solid
D. Networking atomic Solid
Calculate the mole fraction of MgCl2 in an aqueous solution prepared by dissolving .400 moles of MgCl2 in 850.0g of water.
.00841
What is the equation for dynamic equilibrium?
Dynamic equilibrium: Rate of vaporization = rate of condensation
Which of the following has the highest vapor pressure at 25C?
a. C4H10
b. NaCl
c. C6H12O6
d. C4H9NH2
A. C4H10
How much energy is required to vaporize 48.7g of dicholomethane (CH2Cl2) at its boiling point, if its Hvap is 31.6 kj/mol
18.1kJ
Identify the type of solid for ice
A. nonbonding atomic solid
B. Networking atomic solid
C. Molecular Solid
D. Ionic Solid
C. Molecular Solid
A 4.55L sample of water contains .115g of sodium ions. Determine the concentration of sodium ions in ppm if the density of the solution is 1.00g/mL
25.3 ppm
Determine the solubility of CO2 in soda water at 25C if the pressure of CO2 is 5.2atm. The henry's law constant of CO2 is 3.4x10^-2 M/atm
.18M