108年 - [無官方正解]108 國立嘉義大學_轉學生招生考試試題_農學院、生命科學院：普通化學#144348

1. Which of the following molecules has a bond order that differs from the others?
(A) O₂ (B) NO^- (C) BN (D) CO

2. Which of the following molecules has the unpaired electron?
(A) O₂ (B) N₂ (C) F₂ (D) H₂O

3. At STP, Which gas has the highest density?
(A) CO₂ (B) N₂ (C) He (D) C₂H₆

4. For a reaction to take place, the molecules that are reacting:
(A) Must have more energy than the products (B) Must have less energy than the products
(C) Must be able to reach the activation energy (D) Must be in considerable numbers

5. What is the pH of a 0.1 M H₃PO₄ and 0.1 M KH₂PO₄ solution? K_a1 = 7.5×10^-3, K_a2 = 6.2×10^-8, and K_a3 = 4.8×10^-13 (A) 4.67 (B) 3.25 (C) 2.12 (D) 1.56

6. What is the formal charge on the oxygen atom in CO?
(A) +1 (B) 0 (C) -1 (D) -2

7. The frequency of an electromagnetic wave is \(6.0 \times 10^{14}\) Hz. What is its wavelength? (A) \(5 \times 10^{-7}\) m (B) 0.2 \(\mu\)m (C) 500 nm (D) 1000 nm

8. In the hydrogen atom spectrum, for which of the following transitions the light emission has the longest
wavelength?
(A) n = 6 to n = 5 (B) n = 5 to n = 4 (C) n = 4 to n = 3 (D) n = 3 to n = 2

9. Which of the following statements is true?
(A) Water evaporated spontaneously at 1 atm and 101 ˚C because liquid water has the larger entropy than
its vapor at this condition.
(B) Water evaporated spontaneously at 1 atm and 101 ˚C because liquid water has the larger free energy
than its vapor at this condition.
(C) Water evaporated spontaneously at 1 atm and 101 ˚C because liquid water has the larger enthalpy than
its vapor at this condition.
(D) none of these.

10. Which of the following is close to the typical bond energy of a covalent bond?
(A) 1 Kcal/mol (B) 10 Kcal/mol (C) 100 Kcal/mol (D) 1000 Kcal/mol

11. The majority of shell electron transitions in molecules occur in the region of the electromagnetic
spectrum.
(A) IR (B) X rays (C) UV light (D) microwave

12. CO₂ is a greenhouse gas because it absorbs region of the electromagnetic spectrum.
(A) IR (B) X rays (C) UV light (D) microwave

13. What is the major effect or transition to make CO₂ a greenhouse gas?
(A) electronic transition (B) molecular vibration (C) molecular rotation (D) molecular translation.

14. The root mean square speed of N₂ at 300 K is about
(A) 5170 m/s (B) 517 m/s (C) 51.7 m/s (D) 5.17 m/s.

15. Based on Gibbs Free Energy equation ΔG = ΔH − T ΔS, a process will occur spontaneously when
(A) ΔG is positive and ΔS is positive (B) ΔH is positive and ΔT is negative
(C) ΔH is negative and ΔS is positive (D) ΔH is negative and ΔS is negative

16. A catalyst is added to a system at equilibrium. The concentration of the reactants will then
(A) decrease (B) increase (C) remain constant (D) approach zero

17. What is the limiting high-temperature molar heat capacity at constant volume (C_v) of O₂ molecule?
(A) 3/2 R (B) 5/2 R (C) 3 R (D) 7/2 R

18. The difference between the potential energy of the products and the potential energy of the reactants in a
reaction is called
(A) The Temperature of Reaction (B) The Heat of Reaction
(C) The Change of Reaction (D) The Exothermic Reaction

19. Which factors are equal in a reversible chemical reaction that has reached equilibrium?
(A) The number of moles of the reactants and products
(B) The potential energies of the reactants and products
(C) The activation energies of the forward and reverse reactions
(D) The rates of reaction for the forward and reverse reactions

20. A carbonyl group is present in all of these functional groups except
(A) ketones (B) aldehydes (C) esters (D) ethers

21. After 62.0 hours, 1.0 gram of ⁴²K (half-life is 12.4 hours) remained from a sample. What was the mass of
42K in the original sample?
(A) 64 grams (B) 32 grams (C) 16 grams (D) 8 grams

22. Of the statements below, which one can best explain why CH₄ is a gas at STP, while C₈H₁₈ is a liquid and C₂₀H₄₂ is a solid? (A) C₂₀H₄₂ has the greatest ionic interaction between its molecules. (B) C₈H₁₈ has a greater amount of hydrogen bonding than CH₄ or C₂₀H₄₂. (C) There is more dipole-dipole interaction between molecules of greater mass. (D) There are more Van der Waals (dispersion) forces between nonpolar molecules that are greater in mass.

23. w (work) is
(A) less than zero
(B) equal to zero
(C) greater than zero
(D) more information is needed.

24. ∆U (interual energy) is
(A) less than zero
(B) equal to zero
(C) greater than zero
(D) more information is needed.

25. ∆G (Gibb’s free energy) is
(A) less than zero
(B) equal to zero
(C) greater than zero
(D) more information is needed.