Question

1. For each of the following statements, indicate whether it is true or false, and briefly explain your reasoning.

a) A spontaneous reaction always releases heat.

b) A spontaneous reaction is always a fast reaction.

c) The entropy of a system always increases for a spontaneous change.

d) The entropy of a system and its surroundings always increases for a spontaneous change.

e) The energy of a system always increases for a spontaneous change.

2. The reaction shown below is spontaneous at room temperature, but becomes nonspontaneous at a much higher temperature:

N2(g) + 3H2(g) --> 2 NH3(g)

From this fact alone, determine the signs of ΔH° and ΔS°, assuming that these do not change much with temperature. Explain your reasoning.