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

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asked by Alois
  1. 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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