Reflection: Balloon Stoichiometry - Section 4: Elaborate

 

I like to do lots of labs to engage students and get them excited for chemistry.  However, I have found that sometimes students just do the lab but are not actually learning the material. 

In order to help ensure that students are understanding the concepts within the lab it is crucial to continuously check for student understanding.  I do this by walking around the classroom and asking students questions. 

This movie shows an example of my doing this during the balloon lab.  I am asking questions about why the balloon blew up with the goal of having my students explain that the chemical reaction produced carbon dioxide.   This particular group had a hard time coming to this conclusion with answers ranging from "there was a chemical reaction" to "it produced hydrogen gas".  You will see how I lead them to seeing that it is carbon dioxide gas that is responsible for the balloon's expansion.

  Checking for Student Understanding
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Balloon Stoichiometry

Unit 4: Unit 5: Stoichiometry, Chemical Reactions, and First Semester Review
Lesson 3 of 7

Objective: Students will be able to calculate the percent yield of carbon dioxide in the chemical reaction between sodium bicarbonate and acetic acid using a calculated theoretical yield and actual yield from performing an experiment.

Big Idea: Stoichiometry allows chemists to determine the theoretical yield of a product. additionally after performing an experiment chemists can then calculate percent yield using the experimental value from the lab and the theoretical value from calculations.

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Subject(s):
Science, Chemistry, stoichiometry, Chemical Reactions and Balancing, limiting reactant, excess reactant, percent yield, theoretical yield
  90 minutes
balloon lab
 
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