Chemistry (Hot/Cold packs), science homework help

Research at least three different versions of heat or cold packs. Use different Internet sites to investigate how these various products work. Note whether they involve chemical or physical changes. If they involve chemical changes, describe the chemicals involved. Write at least one five sentence paragraph to describe each pack. Be sure to cite all of your sources.

Remember, a change in state alone is just a physical change. Chemical changes involve the changes in the composition of the reactants.

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