When the chemists who designed hand warmers were working, they had to consider how much heat they could give off to keep people warm  — and not burn anyone in the process. How is this heat given off in a chemical reaction measured? Explore calorimetry in the video that demonstrates the change in heat of chemical reactions.

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CCSS: Adaptable
NGSS: Adaptable
Additional Tags
Instructional Ideas
  • Review safety procedures in lab 
  • Pass out hand warmers and ask pairs of learners how they work and have them write down the answers; after the video, discuss original answers and tweak to add new information learned before discussing as a class
Classroom Considerations
  • Classroom must have a computer, Internet access, and a projection system 
  • Video shows a demonstration of change in heat in a chemical reaction between hydrochloric acid and sodium hydroxide
  • Host of video states, "I should be wearing gloves," when mixing chemicals, which is a poor representation of safety within the chemistry lab; he also stirs a mixture with a thermometers and states, "...should never, ever be done in schools ... broken thermometer ..."
Common Core