Final answer:
Nonspontaneous processes can become spontaneous with a change in temperature, as the equation ΔG = ΔH - TΔS shows that temperature affects the free energy change of a system, and thus its spontaneity.
Step-by-step explanation:
It is true that nonspontaneous processes can become spontaneous with a change in temperature. The spontaneity of a process relies on the changes in both enthalpy (ΔH) and entropy (ΔS) as well as the temperature of the system. According to the equation for free energy change, ΔG = ΔH - TΔS, a process is spontaneous if ΔG is negative. For a nonspontaneous process where ΔG is positive, changing the temperature could alter the sign of ΔG, thus potentially making the process spontaneous.
This is seen in phenomena such as phase transitions, where the direction of spontaneity is dependent on whether the temperature is above or below the melting/freezing point of the substance. For example, ice will spontaneously melt at room temperature; however, the freezing of water into ice is nonspontaneous without the input of energy, such as cooling below the freezing point.