Identifying Endothermic and Exothermic Reaction
Instant cold packs use chemical reaction. Are these reactions endothermic or exothermic?
- Endothermic – takes heat from surroundings
- Exothermic – gives heat to surroundings
- Cold pack – feel cold, lower temperature then normal surroundings, absorbs heat energy
- Heat flows from hot to cold → cold pack takes heat
Cold packs are endothermic because they take heat from their surroundings.