3. A hand warmer pack is shaken, and the chemical reaction causes the pack to feel warm. What kind of reaction is this?
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A. This is an exothermic reaction because the system took energy from the surroundings
B. This is an exothermic reaction because energy went from the system to the surroundings
C. This is an endothermic reaction because energy went from the system to the surroundings.
D. This is an endothermic reaction because the system took energy from the surroundings
1 answer
B. This is an exothermic reaction because energy went from the system to the surroundings.