1. A system consisting of liquid water and ice undergoes a process. At the end of the

process, the ice has melted and the system contains only liquid water. Can the system be

considered a pure substance during the process? Explain.

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2. What is the difference between the triple point and triple line?

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3. What rule do we use to retrieve the unknown specific volume between two temperature

points on T-v diagram?

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4. If a substance undergoes a constant-pressure expansion at a pressure higher than its critical

pressure, can it undergo a phase change? If so, what phases are involved?

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