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.
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
1 answer