- The entropy of a system increases during which phase change?
Entropy is a thermodynamic property that quantifies the amount of energy that is unavailable for work in a thermodynamic system. Entropy is a measure of randomness or disorder, and it increases in all natural processes. More specifically, entropy increases during phase changes, such as when a substance changes from one physical state to another. For example, when a substance melts, it changes from a solid to a liquid, and when it boils, it changes from a liquid to a gas. In both cases, the entropy increases because the particles gain more freedom of movement as they transition into the next phase (Rajamani, 2018).The increase in entropy during phase changes is related to the concept of entropy being a measure of disorder. During a phase transition, the particles gain more freedom of movement and become less organized, which is why the entropy increases. This is also why entropy increases during spontaneous processes, such as when a hot object cools down – the particles become less organized as the energy is dissipated (Rajamani, 2018). Entropy is an important thermodynamic property because it can be used to determine the direction of a process. According to the second law of thermodynamics, the entropy of a system can never decrease. Therefore, if a reaction or process is spontaneous, it must have an increase in entropy. This is why entropy increases during phase changes, and it is why a substance will always transition from a solid to a liquid or gas under the right circumstances. Cont…
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