Ideal Gas Law and Partial Pressures
Root Mean Squared and Graham's Law
Intermolecular Forces
Phase Changes
Miscellaneous
100
The R constant's most commonly used value AND units
0.08206 (L*atm)/(mol*K)
100
Respectively, this is the escape of molecules through a tiny hole into an evacuated space, whereas this other term is the spread of one substance throughout a space or a second substance
effusion and diffusion
100
This intermolecular force is associated with instantaneous and random dipole moments
London Dispersion Forces
100
Going from a gas to a solid is called this
deposition
100
Dispersion forces and dipole-dipole forces are collectively referred to as this
van der waals
200
The mole fraction of nitrogen gas in a balloon if I have 3.0 atm total and 0.5 atm of nitrogen
0.166667
200
This is the temperature in Celsius where gaseous nitrate will have a root mean squared of 3.14 m/s
2210.32 C
200
If salt was to dissociate in water, this would be the STRONGEST intermolecular interaction occurring, and the WEAKEST would be this.
Strongest: ion-dipole
Weakest: london dispersion forces
200
The pressure that is considered normal on a phase diagram
1 atm, 1.01325 bar, 760 mmHg, 760 torr, etc...
200
Two glasses are simultaneously being filled with two different liquids. After the same amount of time, the first glass has less liquid in it than the second, which means the first liquid has a greater _____ than the other
viscosity
300
A vessel with 12 bars of pressure, 76 moles of gas, and 15.8 liters of gas will have this temperature in Celsius
PV = nRT
(11.8431 atm)(15.897 L) = (76 moles)(0.08206 R)(T)
T = 30.19 K = -243.19 C
300
This is the molar mass of a molecule with a root mean squared of 12.33 m/s at 500 K
16.04 g/mol
300
With this molecule, you would expect to see these intermolecular forces.
Dipole-dipole
Hydrogen Bonding
London Dispersion Forces
300
Deposition is considered this, a thermodynamic descriptor dealing with the transfer of heat.
exothermic
300
The four properties that are affected by intermolecular forces
Boiling/melting point
Viscosity
Surface tension
Capillary Action
400
An ideal gas is in a vessel at 50 atm and a temperature of 30 C in the summer. However, winter is coming. A couple of months later, the vessel cools to -12 C, and the pressure has changed to this value in bars.
43.6394337 bar
400
A balloon is filled with helium gas and bromine gas. If the helium is effusing at a rate of 34 moles per second, then this value is the effusion rate for bromine gas.
5.38 mol/sec
He2 = 4.003 g/mol
Br2 = 159.808 g/mol
400
Rank the following atoms/molecules from lowest to highest boiling point based on intermolecular forces:CH3-CH3; CH4; Ar; CH3Cl
Ar < CH4 < CH3-CH3 < CH3Cl
400
If temperature was held constant at -10 C and pressure decreased from 600 torr to 10 torr, the substance would undergo this phase change.
Sublimation
400
The molecular weight of a molecule is not the only factor that affects London dispersion forces. 2 molecules could have the same molecular weight, but the molecule with the greater value of this property will undergo more dispersion forces
surface area
500
In a vessel, moles and volume are kept constant. The pressure decreases to 60% of its original value, so the temperature decreases by this factor.
3/5 or 60%
500
A sample of hexafluoride was found the effuse 5 times faster than an unknown. This is the value of the molar mass for the unknown.
r1 / r2 = sqrt(M2 / M1)
r1 = 5r2
5r2 / r2 = sqrt(M2 / 146.06 (g/mol))
25 = M2 / 146.06
M2 = 3651.5 g/mol
500
Rank the following atoms/molecules from lowest to highest vapor pressure based on intermolecular forces: Water, table salt, carbon dioxide, benzene, and ethanol
Carbon dioxide > Benzene > ethanol > water > Table salt
500
(provide all to be correct):
The phase change occurring at B
The phase at E
The phase change occurring at D
The phase at A
B: freezing OR melting
E: Gas
D: evaporating OR condensing
A: solid
500
The ______ of all partial pressures will equal the _____ pressure, and the total pressure multiplied by the ______ will equal the partial pressure
1.) sum
2.) total
3.) mole fraction