Types of IMFS
The weakest intermolecular force found in all molecules.
What are London dispersion forces?
Convert 25°C to Kelvin for use in vapor pressure equations.
What is 298 K?
Which formula is used to calculate heat during temperature change?
What is q = mcΔT?
At 1 atm and 100°C, water exists in this phase.
What is gas?
At higher temperatures, most solid solutes show this solubility trend.
What is increasing solubility?
Which compound has stronger intermolecular forces: NH₃ or CH₄
What is NH₃?
If vapor pressure increases rapidly with temperature, this indicates ____ intermolecular forces.
What are weaker intermolecular forces?
Calculate q when 50 g of water (c = 4.18 J/g·°C) warms from 20°C to 30°C.
What is 2090 J?
This variable is shown on the y-axis of a standard phase diagram.
What is pressure?
If 50 g dissolves but only 40 g is soluble, the excess will ____.
What is precipitate?
Rank the following in order of increasing boiling point: CH₃OH, CH₄, CH₃Cl
What is CH₄ < CH₃Cl < CH₃OH?
A liquid has a vapor pressure of 120 torr at 298 K.
Without doing a full calculation, predict what happens to the vapor pressure when the temperature increases to 320 K.
What is that the vapor pressure increases?
How much energy is required to melt 25 g of ice if ΔH = 334 J/g?
What is 8350 J?
Crossing this boundary converts a solid directly into a gas without becoming a liquid.
What is the sublimation curve?
The general rule “like dissolves like” refers to this property.
what is polarity?
Between hexane (C₆H₁₄) and pentane (C₅H₁₂), estimate which has the higher boiling point and why.
What is hexane, due to greater London dispersion forces?
A substance has a vapor pressure of 85.0 torr at 290 K. Its enthalpy of vaporization is 30.0 kJ/mol. Calculate the vapor pressure at 310 K.
What is 190 torr?
How much energy is required to heat 50.0 g of ice from −10°C to 0°C, and then melt it completely?
Given:
Specific heat of ice: c=2.09 J/g°C
Enthalpy of fusion: ΔHfus=334 J
What is approximately 1.77×1041.77 \times 10^41.77×104 joules?
If pressure decreases at constant temperature, a liquid will eventually ____.
What is vaporize?
A solution contains 45 g of solute when only 35 g should dissolve at that temperature. Classify the solution.
What is supersaturated?
Two unknown liquids, A and B, have the same molar mass (78 g/mol).
Liquid A boils at 65°C, while liquid B boils at 82°C.
What is Liquid B, because it has stronger intermolecular forces, likely due to hydrogen bonding or stronger dipole–dipole interactions compared to liquid A?
Given:
P₁ = 200 torr
T₁ = 300 K
T₂ = 350 K
ΔHvap = 35,000 J/mol
Solve for P2?
1480 torr
Calculate the total energy required to:
Heat 20 g of ice from 0°C to steam at 100°C.
ΔHₓᵤₛ = 334 J/g
ΔHᵥₐₚ = 2260 J/g
c = 4.18 J/g·°C
What is ≈ 52,000 J?
At a pressure below the triple point, heating a solid will cause this phase change.
What is sublimation?
A solution that contains the maximum amount of solute at a given temperature is called this.
What is saturated?