25. For which of the following substances would hydrogen bonding be most important? a. H2Se b. H2S с. Н.Те d. H20 е. HBr 26. The boiling point of H2O is higher than H2S due to a. ion-dipole forces d. covalent bonds b. hydrogen bonding e. magic c. London forces

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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Please help me with questions 25 & 26. Thank you in advance

**Questions and Explanations of Physical Chemistry Concepts**

19. **Lattice Points and the Cubic Unit Cell**
   - How many lattice points are needed to fully define a face-centered cubic unit cell?
     - a. 2
     - b. 4
     - c. 8
     - d. 9
     - e. 14

20. **Phase Diagram Analysis**
    - 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 Diagram:*
    - The phase diagram shown is a plotted graph with axes labeled as P (Pressure) and T (Temperature). It includes points labeled A, B, C, D, E, F, and G that indicate regions or states of matter.

21. **Phase Change Terminology**
    - 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. **Volatility Comparison**
    - Which of the following is most volatile?
      - a. CBr₂H₂
      - b. CCl₃H
      - c. CBr₄
      - d. CCl₄
      - e. CF₄

23. **Boiling Point Factors**
    - 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. **Boiling Point Hierarchies**
    - Which of the following has the highest boiling point?
      - a. Xe
      - b. Kr
      - c. Ar
      - d. Ne
      - e. He

25. **Hydrogen Bonding**
    - For which of the following substances would hydrogen bonding be most important?
      - a. H₂Se
      - b. H₂S
Transcribed Image Text:**Questions and Explanations of Physical Chemistry Concepts** 19. **Lattice Points and the Cubic Unit Cell** - How many lattice points are needed to fully define a face-centered cubic unit cell? - a. 2 - b. 4 - c. 8 - d. 9 - e. 14 20. **Phase Diagram Analysis** - 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 Diagram:* - The phase diagram shown is a plotted graph with axes labeled as P (Pressure) and T (Temperature). It includes points labeled A, B, C, D, E, F, and G that indicate regions or states of matter. 21. **Phase Change Terminology** - 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. **Volatility Comparison** - Which of the following is most volatile? - a. CBr₂H₂ - b. CCl₃H - c. CBr₄ - d. CCl₄ - e. CF₄ 23. **Boiling Point Factors** - 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. **Boiling Point Hierarchies** - Which of the following has the highest boiling point? - a. Xe - b. Kr - c. Ar - d. Ne - e. He 25. **Hydrogen Bonding** - For which of the following substances would hydrogen bonding be most important? - a. H₂Se - b. H₂S
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