Ideal and Real Gases
Rate of
Effusion
Effusion
Intermolecular Forces
Liquids
Solids
100
A cylinder of O2(g) used in breathing by emphysema patients has a volume of 3.00 L at a pressure of 10.0 atm. If the temperature of the cylinder is 28.0 °C, what mass of oxygen is in the cylinder?
38.8 g
100
Calculate the density of a gas at STP, if a given volume of the gas effuses through an apparatus in 6.60 min and the same volume of nitrogen at the same temperature and pressure, effuses through this apparatus in 8.50 minutes.
2.08 g/L
100
State the primary IMF of each of the following: SO2, NH4+ (in aqueous solution), HCl
Dipole-dipole, Ion-dipole, dipole-dipole
100
Rank the viscosity of the following liquids.
CH3CH2OCH3
CH3CH2CH2NH2
CH3CH2CH2CH2CH2NH2
CH3CH2CH2CH3
1) CH₃CH₂CH₂CH₂CH₂NH₂
2) CH₃CH₂CH₂NH₂
3) CH₃CH₂OCH₃
4) CH₃CH₂CH₂CH₃
100
Classify the following into the appropriate type of solid: H2O(s), SiO2 (glass) , C6H12O6(s), C(s)
Molecular: C6H12O6(s), H2O(s)
Network: C(s), SiO2 (glass)
200
A real carbon dioxide gas (1.00 mole) at 373 K occupies 536 mL at 50.0 atmosphere pressure. What is the calculated value of the pressure if a = 3.61 L2 atm mol-2; b = 0.0428 L mol-1?
49.6 atm
200
A compound composed of carbon, hydrogen, and chlorine diffuses through a pinhole 0.411 times as fast as neon. Select the correct molecular formula for the compound: CHCl3, CH2N2, OH2NH
CHCl3
200
Name ALL existent IMFs of the following: CH₃NH₂, NaNO3 (aqeuous), CH3CH2F
1) LDF, dipole-dipole, H-bond
2) Ion-ion, LDF
3) LDF, dipole-dipole, H-bond
200
What would the concave of mercury (Hg) in a glass cylinder look like? What about the concave of water in a glass cylinder?
concave up, concave down
200
The radius of gold is 144 pm, and the density is 19.32 g/cm3. Does gold crystallize in a face-centered cubic structure or a body-centered cubic structure?
FCC
300
A sample of gas isolated from unrefined petroleum contains 90.0% CH4, 8.9% C2H6, and 1.1% C3H8 at a total pressure of 3.65 atm. What is the partial pressure of C2H6 in atm?
0.32 atm
300
Two porous containers are filled with hydrogen and neon respectively. Under identical conditions, 2/3 of the hydrogen escapes in 6 hours. How long will it take for half the neon to escape?
14.2 hours
300
Arrange each of the following sets of compounds in order of increasing boiling point temperature:
a) HCl, H2O, SiH4
b) F2, Cl2, Br2
c) CH4, C2H6, C3H8
a) SiH4 < HCl < H2O
b) F2 < Cl2 < Br2
c) CH4 < C2H6 < C3H8
300
Define the difference between anisotropic materials and isotropic materials.
anisotropic - matter whose properties depend on the direction it is in.
isotropic - properties that do not depend on the direction it is in
300
The density of Aluminum is 1.25 g/cm^3 with an atomic radius of 178.43 pm. Determine the cubic arrangement (face centered, body centered), of this metal.
Body Centered Cubic
400
Automobile air bags are inflated with nitrogen gas, which is formed by the decomposition of solid sodium azide (NaN3). The other product is sodium metal. Calculate the volume of nitrogen gas at 27 °C and 756 torr formed by the decomposition of 125 g of sodium azide. 2NaN3(s) -> 2Na(s) + 3N2(g)
71.26 L
400
2.278 x 10^-4 mol of an unidentified gaseous substance effuses through a tiny hole in 95.70 s. Under identical conditions, 1.738 x 10¯4 mol of argon gas takes 81.60 s to effuse. What is the molar mass of the unidentified substance?
31.79 g/mol
400
Name ALL IMFs of this compound in an aqeuous solution:
LDF, dipole induced dipole
400
Define and draw the appearance of a liquid's nematic phase, smectic phase, and cholesteric phase.
Nematic - straight but not orderly
Smectic - straight and orderly
Cholesteric - straight and random, overlapping directions
400
x
x
500
Calculate the temperature of 20.0 mole of helium in a 10.0 Liter cylinder at 120 atmospheric pressure if the IMF constant 'a' = 0.0341 L2 at mol-2; and size constant 'b' = 0.0237 L mol-1.
697.6 K
500
A 3.00 L sample of Helium was placed in a container fitted with a porous membrane. Half of the helium effused through the membrane in 25 hours. A 3.00 L sample of Oxygen was placed in an identical container. How many hours will it take for half of the oxygen to effuse through the membrane?
71 hours
500
Rank the following in order of IMF strength (1 being strongest):
D > C > B > A
500
Define and explain the difference between thermotropic liquid crystals and lyotopic liquid crystals.
thermotropic - formed by melting the solid phase
lyotopic - ampiphillic molecules that when a solvent is added, because an orderly fluid structure (liquid crystal)
500
Metallic potassium has a body-centered cubic structure. If the edge length of unit cell is 533 pm, calculate the radius of potassium atom.
231 pm