The freezing point of a solution is
A. lower than the freezing point of the solvent alone because higher temperature is required to accelerate solvent molecular motion enough to overcome obstructon by solute particles..
B. higher than the freezing point of the solvent alone because higher temperature is required to accelerate solvent molecular motion enough to overcome obstruction by solute particles.
C. lower than the freezing point of the solvent alone because lower temperature is required to accelerate solvent molecular motion enough to overcome obstruction by solute particles.
D. lower than the freezing point of the solvent alone because lower temperature is required to slow solvent molecular motion enough to overcome obstruction by solute particles.
E. None of these are true.
i think the asnswer is D
D probably is the correct answer although I would have preferred the reason to be something.......to slow solvent molecular motion enough to overcome the greater separation of the solvent molecules caused by solute particles. It the word obstruction to which I object.
To determine the freezing point of a solution, we need to consider the concept of freezing point depression. Freezing point depression refers to the phenomenon where the freezing point of a solvent is lowered when a solute is added to it.
When a solute is dissolved in a solvent, the solute particles disrupt the regular arrangement of the solvent molecules. This disruption hinders the formation of the crystal lattice that occurs during the freezing process. As a result, a lower temperature is required to slow down the molecular motion of the solvent enough to overcome the obstruction caused by the solute particles.
Based on this understanding, we can analyze the given options:
A. This option suggests that the freezing point of the solution is lower than the freezing point of the solvent alone, which aligns with our explanation. The reason mentioned for this is also correct, as a higher temperature is required to accelerate solvent molecular motion enough to overcome obstruction by solute particles. Therefore, option A is a possibility.
B. This option suggests that the freezing point of the solution is higher than the freezing point of the solvent alone, which contradicts our explanation. Consequently, option B is incorrect.
C. This option suggests that the freezing point of the solution is lower than the freezing point of the solvent alone, which matches our explanation. However, the reasoning mentioned is opposite to what we explained. Lowering the temperature, not increasing it, is required to accelerate solvent molecular motion enough to overcome obstruction by solute particles. Therefore, option C is incorrect.
D. This option suggests that the freezing point of the solution is lower than the freezing point of the solvent alone, which is in line with our explanation. The reasoning mentioned is also accurate, as a lower temperature is required to slow solvent molecular motion enough to overcome obstruction by solute particles. Therefore, option D is a possible answer.
E. This option suggests that none of the given statements are true, which contradicts our explanation. As we established, the freezing point of a solution is indeed lower than the freezing point of the solvent alone due to the presence of a solute. Hence, option E is incorrect.
Based on our analysis, both options A and D can potentially be correct. Additional information or context about the specific solute and solvent would be required to determine the correct answer.