Thermodynamics

8 Jun 2019

VIPEr Fellows 2019 Workshop Favorites

Submitted by Barbara Reisner, James Madison University

During our first fellows workshop, the first cohort of VIPEr fellows pulled together learning objects that they've used and liked or want to try the next time they teach their inorganic courses.

15 May 2019

Hess's Law

Submitted by Will, Bucknell University
Evaluation Methods: 

A short problem set is assigned with the video

Evaluation Results: 

Most students are able to learn the content in this video independently

Description: 

Part 8 of the Flipped Learning in General Chemistry Series. This video shows students how to calculate the enthalpy change for an overall reaction by combining a series of individual steps.

Prerequisites: 
Corequisites: 
Course Level: 
Topics Covered: 
Subdiscipline: 
Learning Goals: 

After watching this video and completing the assigned problems, students should understand the definition of a state function depend, be able to combine chemical reactions to create new balanced equations, and calculate an overall enthalpy change from a series of individual steps.

Time Required: 
10-15 minutes
22 Oct 2018
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-lecture quiz, and on average 70% or more of students correctly answer the in-class clicker questions. 

 

Description: 

This is a flipped classroom activity that is intended for use in a college-level first semester/first quarter general chemistry course, and aims to provide a real-world context for thermochemistry concepts by focusing on the problem of producing hydrogen fuel in a sustainable manner. Current industrial production of hydrogen relies on extracting hydrogen from hydrocarbon molecules. Producing hydrogen in this manner brings about the obvious problem of relying of fossil fuels for a “sustainable” fuel. In this activity students will become familiar with the advantages and disadvantages of using water as a source for hydrogen, learn how steam reforming of ethanol is being used as a hydrogen source, and will use enthalpy calculations to compare the thermochemical properties of these different reactions.

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: 

a) using standard heats of formation to calculate the enthalpy for reactions;

b) comparing the enthalpies of different reactions and evaluating which reactions are more spontaneous from a thermochemical standpoint;

c) evaluate different reactions used to produce hydrogen fuel for use in fuel cell vehicles based on the enthalpy of the reactions;

d) gaining appreciation for research that aims to develop methods of producing sustainable fuel sources and why researchers and/or policy makers would be interested in developing sustainable fuel sources.

 
Equipment needs: 

Suggested technology:

1) online test/quiz function in course management system

2) in-class response system (clickers)

Topics Covered: 
Prerequisites: 
Corequisites: 
Subdiscipline: 
Course Level: 
Implementation Notes: 

See attached instructor notes. 

Time Required: 
50-80 minutes

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