How many lattice points does it require to fully define a face centered cubic unit cell? а. 2 b. 4 с. 8 d. 9 е. 14 In the accompanying phase diagram, a liquid can be present at combinations of temperature and pressure corresponding to points F 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 D P E

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I need help with 19 & 20 please and thank you.

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
   - Diagram: The phase diagram includes points labeled A, B, C, D, E, F, and G along axes of Pressure (P) and Temperature (T).
   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  

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  
   c. London forces  
   d. covalent bonds  
   e. magic  

27. The meniscus of water curves upward in a glass tube forming a "U" shape. This means
   a. water has a low surface tension  
   b. water tends to cover the greatest possible area of the glass  
   c. the
Transcribed Image Text: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 - Diagram: The phase diagram includes points labeled A, B, C, D, E, F, and G along axes of Pressure (P) and Temperature (T). 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 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 c. London forces d. covalent bonds e. magic 27. The meniscus of water curves upward in a glass tube forming a "U" shape. This means a. water has a low surface tension b. water tends to cover the greatest possible area of the glass c. the
Expert Solution
Step 1

19. In the face centered cubic unit cell, there is an atom on every face that is shared between two unit cells, and an atom present on the corner is shared between 8 unit cells.

Step 2

Total lattice points in FCC would be:

12×6 + 18×8 = 4

So, option-b is the correct answer.

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