In terms of energy, how would you classify the following chemical reaction?
2Cu + O2 - > 2CuO + 315 kJ
a. endothermic
b. exothermic
c. both endothermic and exothermic
d. neither endothermic nor exothermic
2. The total amount of energy before and after a chemical reaction is the same. Thus, energy is
a. created
b. destroyed
c. conserved
d. the same as mass
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