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109年 - 109 臺灣綜合大學系統_學士班轉學生聯合招生考試試題：普通化學A#120923

科目：轉學考-普通化學 | 年份：109年 | 選擇題數：6 | 申論題數：19

試卷資訊

所屬科目：轉學考-普通化學

選擇題 (6)

B. For the reaction, O2(g) + 2NO(g) → 2NO2(g), the observed rate law is
Rate = k[NO]2[O2]
Which of the changes list below would affect the value of the rate constant k? Account for your answer. (6%) (A)increasing the partial pressure of oxygen gas. (B)changing the temperature.(C) using an appropriate catalyst.
複選題
A. How many unpaired electrons are in the following complex ions? The atomic number for Ru, Ni, and V is 44, 28, and 23, respectively. en stands for ethylene diamine. Account for your answer. (6%) (A) Ru(NH3)62+ (low spin case) (B)Ni(H2O)62+ (C) V(en)33+
A. The following plot shows a vapor pressure of various solutions of components A and B at some temperature.

 Which of the following statements is false concerning solutions of A and B? If it is false, correct it. (6%) (A)The solutions exhibit negative deviations from Raoult's law. (B)ΔHsoln for the solutions should be endothermic. (C)The intermolecular forces are weaker in solution than in either pure A or pure B. (D) Pure liquid B is more volatile than pure liquid A.(E)The solution with x = 0.6 will have a lower boiling point than either pure A or pure B.

複選題
7. You have 2.4 moles of gas contained in a 4.0-L bulb at a temperature of 32 °C. This bulb is connected to a 20.0-L sealed, initially evacuated bulb via a valve. Assume the temperature remains constant. Please answer the followings. (10%) (A) What should happen to the gas when you open the valve? Calculate any changes of the conditions. (B) Calculate ΔH, ΔH, q, and w for the process you describe in part a. (C)Given your answer to part b, what is the driving force for the process?
複選題
9. You have a concentration cell with Cu electrodes and [Cu2+] = 1.00 M (right side) and 1.0 x 10-4 M (left side). Please answer the followings. (10%) (A) Draw this concentration cell labeling the anode and the cathode, and describing the direction of the electron flow.(B)Calculate the potential for this cell at 25 °C.(C)What will happen (increase or decrease) to the cell potential after enough NH3 is added to the left cell compartment. Account for your answer.
複選題
10. Consider the following graph of binding energy per nucleon as a function of mass number. The graph is shown in the next page. Please answer the following questions. (6%) (Please refer to the image provided in the original document) (A)What does this graph tell us about the relative half-lives of the nuclides? Explain your answer.(B)Which nuclide shown is the most thermodynamically stable? Which is the least thermodynamically stable?(C)What does this graph tell us about which nuclides undergo fusion and which undergo fission to become more stable? Support your answer.

申論題 (19)

1. A. What tests could you perform to distinguish between the following pairs of compounds? (4%) a. CH3CH2CH2CH3, CH2=CHCH2CH3 b. CH3CH2CH2COOH, CH3CH2C(O)CH3 (2-butanone) c. CH3CH2CH2OH, CH3C(O)CH3 (acetone) d. CH3CH2NH2, CH3OCH3
a. 2-ethyl propane
b. 5-iodo-5,6-dimethylhexane
c. cis-4-methyl-3-pentene
d. 2-bromo-3-butanol

a. 66862f8abab2a.jpg

b. 66862fa141c15.jpg

B. Rank the following complex ions in order of increasing wavelength of light absorbed. Account for your answer (4%)
66862fc635e5a.jpg
a. What phases are in equilibrium at each of the triple point?
b. What phase is stable at room temperature and 1.0 atm?
c. What are the normal melting point and normal boiling point of sulfur?
d. Which is the denser solid phase, monoclinic or rhombic sulfur?
A. For the species O2, O2+, and O2-, give the electron configuration and the bond order for each. Which has the strongest bond? (6%)

B. Consider the following Lewis structure, where E is an unknown element:
6686302d37617.jpg
What are the possible identities for element E? Predict the molecular structure for this ion. (6%)

A. The titration of Na2CO3 with HCl has the following qualitative profile:
Please identify the major species in solution as points B, D, and F (6%)
6686306bbf1d1.jpg
B. The salt BX, when dissolved in water, produces an acidic solution. Which of the following could be true? Account for your answer. (There may be more than one correct answer.) (6%)
a. The acid HX is a weak acid.
b. The acid HX is a strong acid.
c. The cation B+ is a weak acid
a. If you want to prepare a buffer solution at pH = 4.0 or pH = 10.0, how would you decide which weak acid-conjugate base or weak base-conjugate acid pair to use?
b. Consider a buffered solution where [weak acid] ＞ [conjugate base]. How is the pH of the solution related to the pKa value of the weak acid?

c. A good buffer possesses a good buffering capacity. What is the buffering capacity? How do the following buffers differ in capacity? How do they differ in pH?
 668632c88b029.jpg