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29. Which of the following gases cannot be liquefied at 25°C? a. C,H6, critical temperature 562 K b. NH3, critical temperature 405 K c. CO2, critical temperature 304 K d. Cl2, critical temperature 419 K e. O2, critical temperature 155 K 30. The critical temperature and pressure of CO2 are 31°C and 73 atm. Which of the following is true? a. At 31°C, CO, cannot be liquefied no matter how great the pressure b. At 31°C, CO, can be solidified at 150 atm c. At 31°C, CO2 can be liquefied at pressures below 73 atm d. At 31°C, CO2 can be liquefied at pressures greater than 73 atm e. At 31°C, CO2 exists as an equilibrium mixture of solid, liquid and vapor 31. The phase diagram for a pure substance is given below. 300+ 250 Liquid 200 + Pressure, 150 + atm Solid 100+ Vapor 50+ 100 200 300 400 Temperature, K What is the lowest temperature at which liquid can exist? b. 0 K a. 150 K с. 250 K d. 400 K e. 200 K 32. The following unit cell is the b. hexagonally close-packed unit cell d. primitive cubic unit cell a. face-centered cubic unit cell c. body-centered cubic unit cell e. coordination number 8 cubic unit cell

29. Which of the following gases cannot be liquefied at 25°C? a. C,H6, critical temperature 562 K b. NH3, critical temperature 405 K c. CO2, critical temperature 304 K d. Cl2, critical temperature 419 K e. O2, critical temperature 155 K 30. The critical temperature and pressure of CO2 are 31°C and 73 atm. Which of the following is true? a. At 31°C, CO, cannot be liquefied no matter how great the pressure b. At 31°C, CO, can be solidified at 150 atm c. At 31°C, CO2 can be liquefied at pressures below 73 atm d. At 31°C, CO2 can be liquefied at pressures greater than 73 atm e. At 31°C, CO2 exists as an equilibrium mixture of solid, liquid and vapor 31. The phase diagram for a pure substance is given below. 300+ 250 Liquid 200 + Pressure, 150 + atm Solid 100+ Vapor 50+ 100 200 300 400 Temperature, K What is the lowest temperature at which liquid can exist? b. 0 K a. 150 K с. 250 K d. 400 K e. 200 K 32. The following unit cell is the b. hexagonally close-packed unit cell d. primitive cubic unit cell a. face-centered cubic unit cell c. body-centered cubic unit cell e. coordination number 8 cubic unit cell

Chemistry
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Please help me with questions 31 & 32. Thank you in advance

### Educational Content on Gases, Phase Diagrams, and Unit Cells #### Multiple Choice Questions **29. Which of the following gases cannot be liquefied at 25°C?** a. C₆H₆, critical temperature 562 K b. NH₃, critical temperature 405 K c. CO₂, critical temperature 304 K d. Cl₂, critical temperature 419 K e. O₂, critical temperature 155 K **30. The critical temperature and pressure of CO₂ are 31°C and 73 atm. Which of the following is true?** a. At 31°C, CO₂ cannot be liquefied no matter how great the pressure b. At 31°C, CO₂ can be solidified at 150 atm c. At 31°C, CO₂ can be liquefied at pressures below 73 atm d. At 31°C, CO₂ can be liquefied at pressures greater than 73 atm e. At 31°C, CO₂ exists as an equilibrium mixture of solid, liquid and vapor #### Phase Diagram Analysis **31. The phase diagram for a pure substance is given below.** - **Axes:** - Y-axis: Pressure (atm) - X-axis: Temperature (K) - **Diagram Areas:** - Shows distinct areas labeled as "Solid," "Liquid," and "Vapor." - Boundary lines separate the regions where the substance exists as a solid, liquid, or vapor. **What is the lowest temperature at which liquid can exist?** a. 150 K b. 0 K c. 250 K d. 400 K e. 200 K #### Crystal Structure Interpretation **32. The following unit cell is the...** - Diagram depicts a cubic structure with spheres at corners and center. a. face-centered cubic unit cell b. hexagonally close-packed unit cell c. body-centered cubic unit cell d. primitive cubic unit cell e. coordination number 8 cubic unit cell This educational content focuses on the physical properties of substances under different conditions and structures, valuable for chemistry students exploring states of matter and crystallography.
Transcribed Image Text:### Educational Content on Gases, Phase Diagrams, and Unit Cells #### Multiple Choice Questions **29. Which of the following gases cannot be liquefied at 25°C?** a. C₆H₆, critical temperature 562 K b. NH₃, critical temperature 405 K c. CO₂, critical temperature 304 K d. Cl₂, critical temperature 419 K e. O₂, critical temperature 155 K **30. The critical temperature and pressure of CO₂ are 31°C and 73 atm. Which of the following is true?** a. At 31°C, CO₂ cannot be liquefied no matter how great the pressure b. At 31°C, CO₂ can be solidified at 150 atm c. At 31°C, CO₂ can be liquefied at pressures below 73 atm d. At 31°C, CO₂ can be liquefied at pressures greater than 73 atm e. At 31°C, CO₂ exists as an equilibrium mixture of solid, liquid and vapor #### Phase Diagram Analysis **31. The phase diagram for a pure substance is given below.** - **Axes:** - Y-axis: Pressure (atm) - X-axis: Temperature (K) - **Diagram Areas:** - Shows distinct areas labeled as "Solid," "Liquid," and "Vapor." - Boundary lines separate the regions where the substance exists as a solid, liquid, or vapor. **What is the lowest temperature at which liquid can exist?** a. 150 K b. 0 K c. 250 K d. 400 K e. 200 K #### Crystal Structure Interpretation **32. The following unit cell is the...** - Diagram depicts a cubic structure with spheres at corners and center. a. face-centered cubic unit cell b. hexagonally close-packed unit cell c. body-centered cubic unit cell d. primitive cubic unit cell e. coordination number 8 cubic unit cell This educational content focuses on the physical properties of substances under different conditions and structures, valuable for chemistry students exploring states of matter and crystallography.
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