Asked by Alois

Which of the following is an endothermic reaction

- rusting a nail in water
- a cold pack, cooling
- mixing strong hydrochloric acid and strong ammonium hydroxide
- a heat pack
Answered by DrBob222
I'm not sure I understand the answers. However, I suspect the answer to this question is b.
cold pack + heat = warm
Warming the cold pack is endothermic; the cold pack is cooling something else and it absorbs heat to do that.
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