Answer:
one substance must dissolve in another
solution's temperature can increase, decrease or stay the same
1. exothermic is when temperature increases:
Disposable hand warmers have an exothermic reaction that, in essence, just creates:
rust!!!
handwarmers have:
iron powder, salt, water, an absorbent material, and activated carbon.
When its removed from its outer packaging:
oxygen drifts across the pouch’s permeable covering.
With salt & water present:
oxygen reacts with the iron powder inside to form (rust!) iron oxide (Fe2O3) and releases heat
2. endothermic is when temperature decreases
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