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
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

  • Good use of hand warmers (something most high school learners know about) to explain and demonstrate enthalpy

  • Lengthy explanation and use of the mathematical formula for enthalpy may confuse some learners
Common Core