NAME Sha Lu DATE 1/26/22 CLASS 5 ANALYZING DATA Analyze Phase Diagrams A phase diagram shows, at any given temperature and pressure, the state of a certain substance, and the conditions where different states can be in equilibrium. The triple point, shown at where the three lines X, Y, and Z meet, is the temperature and pressure where solid, liquid, and gas can coexist. The critical point shows the minimum temperature and pressure where a substance can exist as both a liquid and gas. It is the point where it becomes a supercritical fluid. Supercritical fluids are used for industrial processes, including an alternative way to dye fabrics. 1. SEP Analyze Data Look at the phase diagram. What is the state of matter for methanol at a temperature of −0.1°C and a pressure of 2.5 atm? The state of matter for methanol at a temperature of −0.1°C and a pressure of 2.5 atm is gas 2. SEP Analyze Data Look at the phase diagram. What is the state of matter for methanol below −97.65ºC and 1 atm? The state of matter for methanol below −97.65ºC and 1 atm is solid Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format. NAME Sha Lu DATE 1/26/22 CLASS 5 3. SEP Analyze Data Use the phase diagram to estimate the temperature and pressure for methanol at the triple point and the critical point. triple point: -97.65 c and 0.9765 atm critical point: -97.65 c and 0.9765 atm 4. SEP Analyze Data The lines on the phase diagram are labeled X, Y, and Z. Identify which line shows these phases. sublimation: x melting: y vaporization z 5. SEP Interpret Data A solid sample of methanol is stored as a solid at −95°C in a pressurized container. Describe what will happen if the pressure is gradually reduced to normal atmospheric pressure while the temperature is maintained. If the pressure is gradually reduced to normal atmospheric pressure while the temperature is maintained then the methanol will become a gas 6. SEP Interpret Data Based on the temperature and pressure conditions of your classroom, in what state of matter would you expect to find a sample of methanol? I would expect to find a sample of methanol in a liquid. Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format. NAME Sha Lu DATE 1/26/22 CLASS 5 7. SEP Interpret Data Explain what is happening to the intermolecular forces as a substance moves across line X from the left to the right. How does this compare to the molecular behavior as a substance changes across line Z from the right to the left? The intermolecular forces when they move to the left are moving slowly while going to the right they’re moving much more quickly. This compares to the molecular behavior as a substance changes across line Z from the right to the left as it's not a gas. 8. SEP Engaging in Argument Use the phase diagrams for CO2 and H2O in the Experience Notebook. Theaters sometimes use dry ice (solid CO2) to produce dense clouds of smokelike fog onstage. A classmate claims that the phase diagrams of H2O and CO2 show that it would not be practical to use H2O for this purpose. Do you agree with the classmate’s claim? Cite reasons to support your argument. I agree because water enters a similar form of smoke/steam at incredibly hot temperatures versus carbon dioxide which enters this state at room temperature. Both must undergo procedures of sublimation where solids transfer directly from solids to gases, skipping the liquid state. Water contains ionic hydrogen bonds of which are incredibly strong particle arrangements, therefore requiring much higher temperatures to divide these particles forming high pressure. Since carbon dioxide is formed from a covalent bond, the intermolecular forces are relatively weak making the process of sublimation quite instant when this substance experiences exposure to specific temperatures. Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format.
