Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Please help me with questions 21 & 22. Thank you in advance.
Transcribed Image Text:### Phase Diagram and Chemistry Quiz
#### Questions:
**19. How many lattice points does it require to fully define a face-centered cubic unit cell?**
- a. 2
- b. 4
- c. 8
- d. 9
- e. 14
**20. In the accompanying phase diagram, a liquid can be present at combinations of temperature and pressure corresponding to points:**
- a. A, B, C, and G
- b. A, C, G, and D
- c. G, C, D, and E
- d. A and D only
- e. A, C, D, and F
*Explanation of the Phase Diagram:*
The diagram is a typical phase diagram with Pressure (P) on the vertical axis and Temperature (T) on the horizontal axis. It shows several marked points (A, B, C, D, E, F, G) illustrating different phases. Phase boundaries are indicated showing conditions under which different phases (e.g., solid, liquid, gas) exist.
**21. When a liquid undergoes a phase change to a gas, the process is called:**
- a. condensation
- b. deposition
- c. fusion
- d. sublimation
- e. vaporization
**22. Which of the following is most volatile?**
- a. CBr₂H₂
- b. CCl₃H
- c. CBr₄
- d. CCl₄
- e. CF₄
**23. The boiling point of Br₂ is higher than Cl₂ due to:**
- a. dipole-dipole forces
- b. London forces
- c. hydrogen bonding
- d. covalent bonds
- e. magic
**24. Which of the following has the highest boiling point?**
- a. Xe
- b. Kr
- c. Ar
- d. Ne
- e. He
**25. For which of the following substances would hydrogen bonding be most important?**
- a. H₂Se
- b. H₂S
- c. H₂Te
- d. H₂O
- e. HBr
**26. The boiling point of H₂O is higher than H₂S due to:**
- a. ion-dipole forces
- b. hydrogen bonding
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