Question

A _____ reaction is endothermic and has an increase in enthalpy.

a. forward
b. reverse
c. spontaneous
d. nonspontaneous

Answer 1

I don't know if there is one definitive answer. Using the equation (delta)G=(delta)H-T(delta)S and the fact that a reaction is spontainius whenever delta G is negative. If delta H is positive and delta S is positive the reaction is only spontainius at high temperatures. If delta H is positive and delta S is negative the reaction is never spontaneous. If the delta H is negative and the delta S is positive the reaction is always spontaneous. If delta H is negative and delta S is negative the reaction is only spontaneous at low temperatures. This equation basically shows that an endothermic reaction can be spontaneous or non-spontaneous. An endothermic process can be the forward reaction or reverse reaction since an exothermic process has an endothermic reverse reaction. I hope this helps. Let me know in the comments if I miss read the question or if anything is unclear.

Answer 2

The correct option is: d. nonspontaneous

Step-by-step explanation:

A non-spontaneous reaction, also known as endergonic reaction, is a chemical reaction in which the energy is absorbed by the system from the surroundings. This is because energy of the reactants is less than the energy of the products.

Thus, the enthalpy change for a non-spontaneous reaction (ΔH) is positive. Therefore, it is an endothermic reaction.