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chem 219 Exam with Questions Already 100% Answered
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chem 219 Exam with Questions Already100% Answered
Which of the following aqueous solutions would have the highest vapor pressure? -
✔✔According to Raoult's Law, the vapor pressure of a solution is proportional to
the mole fraction of solvent, and therefore, inversely proportional to the total solute
concentration. So, the lowest molarity of ions will have the highest vapor pressure.
Since ionic compounds dissociate in aqueous solution and molecular compounds do not,
the total concentration of ions is lowest in CH₃OH (0.10 M). The other solutions (all
ionic) have total solute concentrations greater than 0.10M.
Which of the following statements is true? - ✔✔When a nonvolatile solute is
added to a solution, the solvent vapor pressure decreases.
Which of the following aqueous solutions would have the highest boiling point? -
✔✔The dissolved solute will raise the boiling point. The more "things" that are
dissolved (ions or molecules), the higher the boiling point will be. The CaCl₂ will break
up into one Ca²⁺ ion and two Cl⁻ ions and there will be a concentration of 3.0 m of
"things" in solution. The other choices will have fewer "things" in solution and will raise
the boiling point less.
Which one of the following aqueous solutions would have the highest freezing point?
- ✔✔The dissolved solute will lower the freezing point. The more "things" that are
dissolved (ions or molecules), the lower the freezing point will be. Since C₆H₁₂O₆ is a
molecule, it will not break apart and there will only be a concentration of 1.0 m of
molecules in solution. It will lower the freezing point less than all the other choices.
, There will be fewer "things" in solution and this will lower the freezing point less
than the other choices.
osmotic pressure equation - ✔✔π = iMRT
Avogadro's Law - ✔✔equal volumes of gases at the same temperature and
pressure contain equal numbers of molecules
Boyle's Law - ✔✔Boyle's Law states that at constant temperature and
moles, pressure and volume are inversely proportional.
Mathematically this is written as: PV = PV
Charles' Law - ✔✔the law that states that for a fixed amount of gas at a constant
pressure, the volume of the gas increases as the temperature of the gas increases
and the volume of the gas decreases as the temperature of the gas decreases
Gay-Lussac's Law - ✔✔the pressure of a gas is directly proportional to the
Kelvin temperature if the volume is constant
Combined Gas Law - ✔✔the relationship between the pressure, volume,
and temperature of a fixed amount of gas
Ideal Gas Law - ✔✔PV=nRT
R=.0821
If 5.00 g of Gas A and 5.00 g of Gas B are mixed in the same container, and the partial
pressure of Gas B is determined to be twice that of Gas A, what do we know about the
gases? - ✔✔If Gas A has half the partial pressure of Gas B, this indicates that there
are fewer moles of it at the same mass, and therefore Gas A has twice the molar mass
of Gas B
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