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This activity is intended for use in a college-level second term general chemistry course, and is designed to engage students in a guided concept development exercise that will help them construct conceptual understanding of how non-volatile solutes impact the boiling point and freezing point of aqueous solvent.
| Attachment | Size |
|---|---|
| In-class Activity Sheet | 32.37 KB |
| Instructor Facilitation Notes | 20.72 KB |
a) Describe the effect of solute on the boiling and freezing points of a solvent
b) Determine the boiling point and freezing point of solutions
n/a
See attached instructor notes.
Evaluation
Students worked on the activity in ad-hoc collaborative groups and completed all of their work in their notes or on a printed hard copy of the activity sheet. Student answers/work were not collected, however selected questions from the activity sheet were converted to in-class multiple choice poll questions and all students submitted these questions individually (though in consultation with their group members). The in-class poll questions were administered throughout the course and in total counted for 10% of the final course grade.
Post-activity reflections were also collected within 48 hours of the activity via submission of scanned hand-written forms (these were collected using Gradescope). Students were asked to list any concepts/ideas that were not clear after completion of the activity sheet (i.e., they were asked to list the "muddiest point").
All in-class poll questions were answered correctly by 80% or more of the students, and there were no "muddiest point" concepts/items that were listed more than 1% of the class.