113年 - 113 台灣聯合大學系統_學士班轉學生考試試題_A6：普通化學#138693

1 What is the reaction order of the following reaction if the half-life of reactant A is independent on its initial concentration?

aA → products (A)zero order (B)first order (C)second order (D)both zero and first orders (E)both zero and second orders

2 Which of the following acids and its sodium salt are the best combination for buffering a solution at pH 4.30? (A)chloroacetic acid (Kₐ=1.35×10⁻³) (B)propanoic acid (Kₐ=1.3×10⁻⁵) (C)benzoic acid (Kₐ=6.4×10⁻⁵) (D)hypochlorous acid (Kₐ=3.5×10⁻⁸) (E)none of the above is acceptable

3 How many molecules below have resonance structures?

O₂, O₃, N₂, NO₃⁻, SO₄²⁻ (A)1 (B)2 (C)3 (D)4 (E)5

4 Which of the following solutions exhibits the greatest osmotic pressure, assuming all the solutions have the same molarity? (A)NaCl (B)MgCl₂ (C)MgSO₄ (D)HCl (E)Glucose

5 What is the bond order of diatomic molecules C₂? (A)0 (B)1 (C)2 (D)3 (E)4

6 If an atom has 23 electrons, how many electron shells will be occupied? (A)1 (B)2 (C)3 (D)4 (E)5

7 What is the formal charge for oxygen atoms in a sulfate ion with the most stable Lewis structure? (A)-2 (B)-1 (C)0 (D)1 (E)2

8 Which of the following statements about a catalyst is true? (A)It changes the equilibrium constant (B)It speeds up only the rate of the forward reaction (C)It is consumed in the course of the reaction (D)It lowers the activation energy for a reaction (E)none of the above

9 Arrange the following ions in order of decreasing size. (A)O²⁻＞Na⁺＞Al³⁺ (B)O²⁻＞Al³⁺＞Na⁺ (C)Na⁺＞Al³⁺＞O²⁻ (D)Al³⁺＞O²⁻＞Na⁺ (E)Al³⁺＞Na⁺＞O²⁻

10 What is the definition of Lewis acid? (A)electron-pair donor (B)electron-pair acceptor (C)H⁺ donor (D)H⁺ acceptor (E)H⁺ producer

11 What percentage of the tetrahedral holes are occupied in a zinc sulfide crystal? (A)0% (B)25% (C)50% (D)75% (E)100%

12 Consider the reaction:

Estimate the carbon-fluorine bond energy given that the C-C bond energy is 347 kJ/mol, the C=C bond energy is 614 kJ/mol, and the F-F bond energy is 154 kJ/mol. (A)64 kJ/mol (B)128 kJ/mol (C)421 kJ/mol (D)485 kJ/mol (E)970 kJ/mol

13 How is the central atom in XeF₄ hybridized? (A)sp (B)sp² (C)sp³ (D)dsp³ (E)d²sp³

14 What is the cathode reaction for a typical iron corrosion process? (A)2Fe+O₂+2H₂O→2Fe²⁺+4OH⁻ (B)Fe→Fe²⁺+2e⁻ (C)Fe²⁺+2e⁻→Fe (D)4OH⁻→O₂+2H₂O+4e⁻ (E)O₂+2H₂O+4e⁻→4OH⁻

15 Determine the pH at the first equivalent point for the titration of a H₃PO₄ solution with NaOH. (A)pH=pKₐ₁ (B)pH=pKₐ₂ (C)pH=pKₐ₃ (D)pH=(pKₐ₁+pKₐ₂)/2 (E)pH=(pKₐ₂+pKₐ₃)/2

16 Order the relative energies of the orbitals in the n=3 shell for polyelectronic atoms. (A)E₃ₛ＜E₃ₚ＜E₃d (B)E₃ₛ=E₃ₚ=E₃d (C)E₃ₛ＞E₃ₚ＞E₃d (D)E₃ₛ=E₃ₚ＞E₃d (E)E₃ₛ＞E₃ₚ=E₃d

17 Which molecule has the smallest bond angle? (A)CH₄ (B)NH₃ (C)PH₃ (D)H₂O (E)all the same

18 At constant pressure, the change in which property of a system is equal to the energy flow as heat? (A)internal energy (B)work (C)entropy (D)Gibbs free energy (E)enthalpy

19 Under what conditions does a real gas exhibit nearly ideal behavior? (A)high temperature and high pressure (B)high temperature and low pressure (C)low temperature and high pressure (D)low temperature and low pressure (E)it is independent on temperature and pressure

20 Chromatography is used to separate a mixture into individual components based on the differences in which properties of the components? (A)particle size (B)boiling point (C)ionic conductivity (D)polarity (E)density