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Where does the heat come from in hand warmers? Learn about enthalpy, the change in energy in a system, to see that when chemical bonds are broken or formed, energy moves into and out of a system because of chemical reactions.
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CCSS:
Adaptable
NGSS:
Adaptable
Additional Tags
Instructional Ideas
- Pass hand warmers around to pairs of learners and have them explain how they give off heat
- Repeat after the video and have learners tweak their answers; share as a class
Classroom Considerations
- Classroom must have a computer, Internet access, and a projection system to use the resource
- This video is hosted on YouTube
Pros
- Good use of hand warmers (something most high school learners know about) to explain and demonstrate enthalpy
Cons
- Lengthy explanation and use of the mathematical formula for enthalpy may confuse some learners