During an exothermic chemical reaction,
A) a system becomes warmer and the chemical substances undergo an increase in potential energy.
B) a system becomes warmer and the chemical substances undergo a decrease in potential energy.
C) a system becomes cooler and the chemical substances undergo an increase in potential energy.
D) a system becomes cooler and the chemical substances undergo a decrease in potential energy.
E) a system becomes warmer and additional heat is gained from the surroundings.
Correct Answer:
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