17 Jul 2018

Stoichiometric Calculations: A General Chemistry Flipped Classroom Module

In-Class Activity

Submitted by Jack F Eichler, University of California, Riverside
Course Level: 
Topics Covered: 

This is a flipped classroom activity intended for use in a first semester general chemistry course. Students are expected to have prior knowledge in determining the molar mass of compounds, how to carry out mole/gram conversions, and how to write balanced chemical reactions. The activity includes:

1) pre-lecture learning videos that guide students through carrying out basic stoichiometric calculations, determining the limiting reactant, and determining the percent yield of a reaction;

2) a pre-lecture interactive tutorial that helps students learn the concept of limiting reactant;

3) pre-lecture quiz questions; and

4) an in-class activity that requires students to apply their knowledge of stoichiometry and limiting reactant in the real-world application of converting coal to liquid fuel.

Acknowledgement: This material is based upon work supported by the National Science Foundation under Grant No. 1504989. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.


Learning Goals: 

Students are expected to complete the following learning objectives:

a) using mole-gram conversions and mole-mole conversions to carry out stoichiometric calculations for balanced chemical reactions;

b) gaining appreciation for how stoichiometric calculations are used in real-world chemical reactions.

Prior to completing this activity, students will be expected to have learned how to use molar masses of elements and compounds to carry out mole-gram conversions, how to balance chemical reactions, and how to use balanced chemical reactions to carry out mole-mole conversions.


Equipment needs: 

Suggested technology:

1) online test/quiz function in course management system

2) in-class response system (clickers)

Implementation Notes: 

Attached as separate file. 

Time Required: 
50-80 minutes
Evaluation Methods: 

1) Performance on the pre-lecture online quiz

2) Performance on the in-class activity (clicker scores or hand-graded worksheet)

Evaluation Results: 

Students generally score on average 70% or higher on the pre-lecdure quiz, and on average 70% or more of students correctly answer the in-class clicker questions. As  noted in the worksheet answer key, question #4 generally gives students the most trouble as they may not yet have learned how to sum a series of reactions to yield an overall reaction. Instructors are encoruaged to do an example of this in the acitivty introduction. 

Creative Commons License: 
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