Question

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

Answer 1

  Our equation is: 

2Cu + O₂ --> 2CuO + energy. 

Notice that "energy" is in the list of products (energy was "produced" from the reaction). That means the reaction with exothermic (answer is B).