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ws1302key-1

# ws1302key-1 - CH302 Worksheet 1 Answer Key for Physical...

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CH302 Worksheet 1 Answer Key for Physical Equilbria Problems from Lectures 1 through 3 For Questions 1-4, use the Phase diagram below. 1. What is a good general definition of the term triple point? How many triple points are found int he phase diagram for quartz shown above? A triple point is any point at which three distinct phases of a given species are in equilibrium. In terms of a phase diagram, a triple point is any point at which 3 phase boundaries intersect. There are 3 in the figure above. 2. How many phase boundaries are there in the phase diagram for quartz shown above? (Hint: two of them are found on the same line.) There are 9 phase boundaries. The line separating Coesite from α -Quartz and β -Quartz is two phase boundaries. 3. Starting at 0.1 GPa and 200 °C and isobarically raising the temperature to 2000 °C, how many phase transitions would occur? What would the final phase be? There would be 4 phase transitions and the final phase would be Silica Melt. 4. What is a critical point? How many are shown in the phase diagram above? A critical point is a point temperature beyond which the species is a supercritical fluid, regardless of the applied pressure. There are none in the diagram above. 5. Write as many assumptions involved in the derivation of the Clausius-Clapeyron equation as you can. We assume that Δ S vap is a constant, which itself assumes the gas phase acts as an ideal gas. We assume that Δ H vap has a value unaffected by temperature or pressure.

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