115年 - 115 台灣聯合大學系統_學士班轉學生考試試題_A6：普通化學#142699

科目：研究所、轉學考(插大)◆普通化學 | 年份：115年 | 選擇題數：20 | 申論題數：0

試卷資訊

所屬科目：研究所、轉學考(插大)◆普通化學

選擇題 (20)

1. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions? (A) NH₄ and NH₄Cl (B) ZnO₂ and ZnCl₂ (C) H₂O and HCl (D) NO and NO₂ (E) CH₄ and CO₂
2. How many of the following is/are incorrect?
i. The importance of the equation E=mc² is that energy has mass.
ii. Electromagnetic radiation can be thought of as a stream of particles called photons.
iii. Electromagnetic radiation exhibits wave properties.
iv. Energy can only occur in discrete units called quanta.
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4

3. Which of the following atoms or ions has three unpaired electrons? (A) N (B) O (C) Al (D) S²⁻ (E) Ti²⁺

4. Choose the compound with the most ionic bond. (A) LiCl (B) KF (C) NaCl (D) LiF (E) KCl

5. Which of the following pairs is incorrect? (A) NH₄Br ammonium bromide (B) K₂CO₃, potassium carbonate (C) BaPO₄, barium phosphate (D) CuCl, copper(I) chloride (E) MnO₂, manganese(IV) oxide

6. How many of the following molecules have all of their atoms in the same plane?
H₂C=CH₂ OF₂ H₂CO NH₃ CO₂ BeCl₂ (A) 3 (B) 4 (C) 5 (D) 6 (E) 7

7. How many of the following: F₂, B₂, O₂, N₂, are paramagnetic? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4

8. A fuel-air mixture is placed in a cylinder fitted with a piston. The original volume is 0.320-L. When the mixture is ignited, gases are produced and 805 J of energy is released. To what volume will the gases expand against a constant pressure of 635 mmHg, if all the energy released is converted to work to push the piston? (A) 9.19 L (B) 6.96 L (C) 9.83 L (D) 9.51 L (E) 1.59 L
9. Consider the following processes:
2A → (1/2)B + C                      ΔH₁ = 5 kJ/mol
(3/2)B + 4C → 2A + C + 3D    ΔH₂ = -15 kJ/mol
E + 4A → C                              ΔH₃ = 10 kJ/mol
Calculate ΔH for: C → E + 3D
(A) 0 kJ/mol(B) 10 kJ/mol(C) -10 kJ/mol(D) -20 kJ/mol(E) 20 kJ/mol

10. Given a cylinder of fixed volume filled with 1 mol of argon gas, which of the following is correct? (Assume all gases obey the ideal gas law.) (A) If the temperature of the cylinder is changed from 25°C to 50°C, the pressure inside the cylinder will double. (B) If a second mole of argon is added to the cylinder, the ratio T/P would remain constant. (C) A cylinder of identical volume filled with the same pressure of helium must contain more atoms of gas because He has a smaller atomic radius than argon. (D) Two of the above. (E) None of the above.

11. The valve between the 2.00-L bulb, in which the gas pressure is 1.00 atm, and the 3.00-L bulb, in which the gas pressure is 3.10 atm, is opened. What is the final pressure in the two bulbs, the temperature remaining constant?
(A) 0.400 atm (B) 1.84 atm (C) 2.26 atm (D) 1.86 atm (E) 2.05 atm

12. Which of the following is the correct order of boiling points for KNO₃, CH₃OH, C₂H₆, Ne? (A) Ne < CH₃OH < C₂H₆ < KNO₃ (B) KNO₃ < CH₃OH < C₂H₆ < Ne (C) Ne < C₂H₆ < KNO₃ < CH₃OH (D) Ne < C₂H₆ < CH₃OH < KNO₃ (E) C₂H₆ < Ne < CH₃OH < KNO₃
13. Which of the following statements is (are) false?
I. The layering in a hexagonal closest-packed structure is aba.
II. A body-centered cubic unit cell has four atoms per unit cell.
III. For unit cells having the same edge length, a simple cubic structure would have a smaller density than a body-centered cube.
IV. Atoms in a solid consisting of only one element would have six nearest neighbors if the crystal structure were a simple cubic array.
(A) I(B) II(C) II, III(D) I, IV(E) II, III, IV

14. At 40°C, heptane has a vapor pressure of about 92.0 torr and octane has a vapor pressure of about 31.2 torr. Assuming ideal behavior, what is the vapor pressure of a solution that contains twice as many moles of heptane as octane? (A) 61.3 torr (B) 51.5 torr (C) 71.7 torr (D) 82.1 torr (E) none of these

15. The freezing point (Tf) for t-butanol is 25.50°C and Kf is 9.1°C/m. Usually t-butanol absorbs water on exposure to the air. If the freezing point of a 7.6-g sample of t-butanol is measured as 24.59°C, how many grams of water are present in the sample? (A) 0.10 g (B) 0.014 g (C) 10. g (D) 1.4 g (E) 14 g

16. A first-order reaction is 45% complete at the end of 33 minutes. What is the length of the half-life of this reaction? (A) 38 min (B) 29 min (C) 2.0 h (D) 48 min (E) none of these

17. The rate constant for a reaction at 40.0°C is exactly 3 times that at 20.0°C. Calculate the Arrhenius energy of activation for the reaction. (A) 9.13 kJ/mol (B) 5.04 kJ/mol (C) 41.9 kJ/mol (D) 3.00 kJ/mol (E) none of these

18. For a certain reaction at 25.0°C, the value of K is 1.2 × 10⁻³. At 50.0°C the value of K is 3.4 × 10⁻¹. This means that the reaction is (A) exothermic (B) endothermic (C) never favorable (D) more information needed (E) none of these (A-D)

19. Substance X has a heat of vaporization of 57.8 kJ/mol at its normal boiling point (423°C). For the process X(l) → X(g) at 1 atm and 423°C calculate the value of ΔG. (A) 0 J (B) 83.0 J (C) 137 J (D) -83.0 J (E) -137 J

20. The acid dissociation constant for a weak acid HX at 25°C is 3.0 × 10⁻⁹. Calculate the free energy of formation for X⁻(aq) at 25°C. The standard free energies of HX(aq) and H⁺(aq) at 25°C are -203.4 kJ/mol and 0, respectively. (A) -199 kJ/mol (B) 252 kJ/mol (C) 0 (D) -155 kJ/mol (E) -252 kJ/mol

申論題 (0)