1) In comparing the phase diagram for water with that of a solution of sugar in water, all of the following decrease except
a) the vapor pressure
b) the boiling point
c) the freezing point
d) the triple point
I chose the boiling point as the answer. Is this correct? Thank you.
Hannah, I don't understand the question because I can't tell what's being compared. IF we are saying that properties of the sugar solution will decrease except for the following, then your answer is correct.
If we are saying that the properties of the water solution will decrease except for the following: boiling point is not right that way.
ok thank you
No, the boiling point does not decrease when comparing the phase diagram for water with that of a solution of sugar in water. The correct answer is d) the triple point. The triple point is the temperature and pressure at which all three phases of a substance (solid, liquid, and gas) coexist in equilibrium. The presence of a solute like sugar in water will generally lower the triple point temperature. So, in comparing the phase diagram for water with a sugar solution, the triple point will decrease, while the vapor pressure, the boiling point, and the freezing point will generally remain the same or even increase with the addition of a solute.
To compare the phase diagram for water with that of a solution of sugar in water, we need to understand the effect of adding solute (in this case, sugar) to the solvent (water).
When a solute is added to a solvent, it affects the boiling point, freezing point, and vapor pressure of the solution. This alteration occurs due to a decrease in the effective concentration of the solvent molecules, which makes it harder for them to vaporize or freeze.
Now let's analyze the options:
a) Vapor pressure: When a solute is added, the vapor pressure of the solution decreases compared to the pure solvent. This is because the presence of solute particles reduces the number of solvent particles at the surface, resulting in a decreased tendency for the solvent to evaporate. So, vapor pressure decreases.
b) Boiling point: The boiling point of a solution increases when compared to the boiling point of the pure solvent. This is because the solute particles elevate the boiling point of the solution by providing additional resistance to the vapor pressure needed for boiling. So, the boiling point should decrease.
c) Freezing point: The freezing point of a solution decreases when compared to the freezing point of the pure solvent. Adding solute particles disrupts the formation of the solvent's crystal lattice, making it more difficult for the solvent to freeze. So, freezing point should decrease.
d) Triple point: The triple point of a substance is the pressure and temperature at which all three phases (solid, liquid, and vapor) coexist in equilibrium. The addition of solute particles does not typically affect the triple point.
Based on the explanations provided, it seems you have chosen the incorrect answer. The correct answer would be d) the triple point because adding solute particles to the solvent does not usually affect the triple point of a solution.
Therefore, the correct answer is d) the triple point.