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.
- 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 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 ..."