所屬科目：研究所、轉學考(插大)◆普通化學
2. (20 points total) Calculate the pH when 100.0 mL of a 1.00 M solution of H2A () is titrated with the following volumes of 1.00 M NaOH. (A) (5 points) Calculate the initial pH of the solution. (B) (5 points) Calculate the pH of the resulting solution after 75.0 mL of 1.00 M NaOH has been added. (C) (5 points) Calculate the pH of the resulting solution after 100.0 mL of 1.00 M NaOH has been added. (D) (5 points) Calculate the of the resulting solution after 200.0 mL of 1.00 M NaOH has been added.
3. (10 points total) Give a short answer for the following questions: (A) (2 points) What is the maximum number of electrons per orbital? (B) (2 points) The five 4d orbitals can collectively hold how many electrons? (C) (2 points) Each electron in the 8s orbital would have what four quantum numbers? (D) (2 points) How many corresponding orbitals are there for l = 2? (E) (2 points) What is the lowest energy "f" orbital?
5. (16 points total) At room temperature, Fe crystallizes in a body centered cubic structure. The radius of an iron atom is 124 pm. (A) (3 points) How many Fe atoms are there in a unit cell? Show your work. (B) (4 points) What is the volume of a unit cell in cm³ ? (C) (4 points) What is the mass of a unit cell in grams? (D) (5 points) Calculate the density of Fe in g/cm³.
6. (15 points total) Ethylene glycol (C2H6O2) is added to 15.0 L water to produce an antifreeze solution that has a freezing point of -30 °C. (A) (5 points) Calculate the molality of ethylene glycol of this solution. (B) (5 points) Calculate the volume of ethylene glycol in L needed to produce such solution. (C) (5 points) What is the boiling point of this solution?
7. (14 points total) Consider two coordination compounds: Na3 [CoF6] and [Co(NH3)6]Cl3, one of them is high-spin and the other one is low-spin: (A) (4 points) Give the name for both compounds. (B) (6 points) Draw the crystal field splitting diagrams for both compounds and fill in the electrons into the diagram. Which one is high-spin, and which one is low-spin? Are they paramagnetic or diamagnetic? (C) (4 points) One of the compounds is green color and the other one is orange color. Which one is most likely to be green? Which one is most likely to be orange? Briefly explain your choice.
1. (10 points) A 1.00-g sample of a gaseous compound of boron and hydrogen occupies 0.820 L at 1.00 atm and 3 °C. What is the molecular formula for the compound?
4. (15 points) Construct the molecular orbital diagram of O2 and fill in the electrons. Can it describe the paramagnetism of O₂? Explain.
阿摩線上測驗
登入
阿摩線上測驗
登入
) is titrated with the following volumes of 1.00 M NaOH. (A) (5 points) Calculate the initial pH of the solution. (B) (5 points) Calculate the pH of the resulting solution after 75.0 mL of 1.00 M NaOH has been added. (C) (5 points) Calculate the pH of the resulting solution after 100.0 mL of 1.00 M NaOH has been added. (D) (5 points) Calculate the 
of the resulting solution after 200.0 mL of 1.00 M NaOH has been added.