Video: Change the Reaction Rate of a Foaming Reaction

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An experienced chemistry professor used to say that it took about one explosion per week to maintain college students' attention in chemistry lectures. At that rate, we'd get in pretty big trouble with a lot of parents and teachers! Don't worry, we still have lots of bubbles, fizzes, bangs, and color changes for you to explore. Read more
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Use these free STEM lesson plans and activities to teach students about biotechnology—options for all grade levels! Biotechnology involves using biological processes and systems to make or improve products. Using yeast to make bread is often offered as a simple example of biotechnology, as a living organism (yeast) is used to make a specific food product (bread). Many people think of biotechnology, however, in more cutting-edge contexts,… Read more
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Use these free STEM lesson plans and activities to teach and explore chemical reactions with K-12 students. The best way to teach chemical reactions is to show them in action or, when possible, let students get hands-on with exploring the reactions. If you are planning to teach a unit on chemical reactions, you might find just what you need in one the 15+ free STEM lessons and activities listed below. Lesson Plans to Explore Chemical Reactions Lesson… Read more
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Lesson Plan Grade: 9th-12th
In this lesson, students will employ the enzymatic decomposition reaction of hydrogen peroxide to investigate how chemical reactions are affected by enzymes and different substrate concentrations. Students will be challenged to control the rate of the reaction by adjusting the amount of substrate and thus changing the catalase activity. Foam production, created by the enzymatic breakdown of hydrogen peroxide into water and oxygen, will function as a proxy for the reaction rate. Based on their… Read more
NGSS Performance Expectations:
  • HS-PS1-5. Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.
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