Problem 1 [10 points] Truth or Dare (to fix the statement) Indicate whether each

Question

Problem 1 [10 points] Truth or Dare (to fix the statement)

Indicate whether each of the following statements is true or false as it is written. Alter each false statement to make it correct.
(a) If two aqueous solutions containing different nonvolatile solutes exhibit exactly the same vapor pressure at the same temperature, the activities of water are identical in the two solutions.

(b) The most important reason that food cooks more rapidly in a pressure cooker is that equilibrium is shifted in the direction of products at higher pressure.

(c) If solutions of a single solute are prepared at equal molalities but in different solvents, the freezing-point lowering will be the same for the different solutions, assuming that each behaves ideally.

(d) If solutions of a single solute are prepared at equal mole fractions but in different solvents, the fractional vapor-pressure lowering will be the same for the different solutions, assuming that each behaves ideally.

(e) If two liquids, such as benzene and water, are not completely miscible in one another, the mixture can never be at equilibrium.

Explanation / Answer

a) false. it depends on the amount of non volatile solute.

corrected: If two aqueous solutions containing same amount (same mole fraction)of different nonvolatile solutes exhibit exactly the same vapor pressure at the same temperature, the activities of water are identical in the two solutions.

b) false. Pressure cooker increased the atmospheric pressure inside of the cooker and as a result boiling point of water is increased and it cooked faster.

corrected: the most important reason that food cooks more rapidly in a pressure cooker is that the boiling point of water is increased

c) and d) correct . Because colligative properties depends on the amount of solute.

e)correct. solvents are not in equilibrium but if a solute is disolved, it will be in equiiibrium

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