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Hand warmers and instant cold packs use _____________________ that release or absorb thermal energy.

Hand warmers and instant cold packs use _____________________ that release or absorb thermal energy.
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Hand warmers and instant cold packs use _____________________ that release or absorb thermal energy.

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User Needsleep
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Answer: Endothermic and Exothermic reactions

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User Slyv
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