Question
"During an experiment, Robbie poured 100 milligrams (mg) of liquid solvent Y into a beaker and heated it to 75°C. Subsequently, 20 mg of solid solute X was crushed into 1-millimeter (mm) pieces and introduced into the beaker. The mixture was stirred for 1 minute and then left undisturbed for 10 minutes. It was observed that the final solution contained 20% of the solute in the form of an undissolved solid."
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Which of the following modifications would have reduced the quantity of undissolved solid at the conclusion of Robbie's experiment?
(1 point)
Stirring the mixture for 3 minutes instead of 1 minute.
Allowing the mixture to rest for 7 minutes rather than 10 O minutes.
Increasing the temperature of the solvent to 50°C rather than 75°C.
Crushing the solute into particles of 2 mm instead of 1 mm.
Item 22
Item 23
Item 24
Item 25
Which of the following modifications would have reduced the quantity of undissolved solid at the conclusion of Robbie's experiment?
(1 point)
Stirring the mixture for 3 minutes instead of 1 minute.
Allowing the mixture to rest for 7 minutes rather than 10 O minutes.
Increasing the temperature of the solvent to 50°C rather than 75°C.
Crushing the solute into particles of 2 mm instead of 1 mm.
Answers
GPT-4o mini
To reduce the quantity of undissolved solid in Robbie's experiment, the most effective modification would be:
**Stirring the mixture for 3 minutes instead of 1 minute.**
Stirring increases the interaction between the solvent and the solute particles, helping to dissolve more of the solute over time.
The other options would not be as effective:
- **Allowing the mixture to rest for 7 minutes rather than 10 minutes**: This would potentially reduce the time the solute has to dissolve, which is counterproductive.
- **Increasing the temperature of the solvent to 50°C rather than 75°C**: Higher temperatures generally increase solubility for most solutes; thus, using a lower temperature would not aid in dissolving the solute.
- **Crushing the solute into particles of 2 mm instead of 1 mm**: Larger particles have less surface area for the solvent to act upon, making it less likely for them to dissolve.
So, among the provided options, stirring for a longer period of time is the best modification to reduce undissolved solid.
**Stirring the mixture for 3 minutes instead of 1 minute.**
Stirring increases the interaction between the solvent and the solute particles, helping to dissolve more of the solute over time.
The other options would not be as effective:
- **Allowing the mixture to rest for 7 minutes rather than 10 minutes**: This would potentially reduce the time the solute has to dissolve, which is counterproductive.
- **Increasing the temperature of the solvent to 50°C rather than 75°C**: Higher temperatures generally increase solubility for most solutes; thus, using a lower temperature would not aid in dissolving the solute.
- **Crushing the solute into particles of 2 mm instead of 1 mm**: Larger particles have less surface area for the solvent to act upon, making it less likely for them to dissolve.
So, among the provided options, stirring for a longer period of time is the best modification to reduce undissolved solid.