Question

In terms of energy, how would you classify the following chemical reaction? 2Cu + O2 + 315kJ → 2CuO A. endothermic B. exothermic C. both endothermic and exothermic D. neither endothermic nor exothermic

Answer 1

Answer:  A. endothermic

Explanation: Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and $\Delta H$ for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

$2Cu+O_2+315kJ\rightarrow 2CuO$

is an example of endothermic reaction as heat is absorbed by the reactants.

Answer 2

By looking at the reaction, we can see that the reactants must absorb 315kJ of energy in order to form the reactants. This means that the reaction is absorbing energy, which would make it A. endothermic.

Hope this helps!