Limiting Reagent iTRQ

The process by which one calculates the limiting reagent, theoretical yield and excess reagent must be revisited periodically to keep this ability in the student's long-term memory. While this has traditionally been accomplished with untimed homework problems, the proliferation of sites that provide solutions to homework problems has resulted in some students getting the correct answer without altering their long-term memory. In collaboration with Chem21Labs users, we have created iTRQs (interactive TRQs) where students perform a series of steps in a span of time (e.g. 50 - 200 seconds) that, while significantly longer than the normal TRQ time, prevents the use of "outside help".

If students can correctly answer the question before a timer reaches 0 seconds, they will have completed the assignment. If they don't answer the question correctly, they are guided through the individual steps of the calculation with immediate feedback at each step. Students receive full credit on this iTRQ if they . . . .

1. correctly answer the problem presented on the first screen before the timer reaches 0 seconds
2. correctly work the guided step-by-step portions (second screen) "x" number of times (typically x is 2 or 3).

Read the limiting reagent question below and enter an answer in the text box. Then, click the "Check Answer" button. If the correct answer was entered, you receive full credit for the assignment, otherwise you will be guided through the solution just like an instructor would guide their student.