113年 - [無官方正解]113 國立嘉義大學_轉學生招生考試試題_應用化學系：普通化學#143938

1. The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene? (A) C₂H₄ (B) C₈H₈ (C) C₁₀H₁₂ (D) C₆H₆

2. In what type of reaction is water always a product? (A) Precipitation (B) Acid-Base (C) Decomposition (D) Synthesis

3. What is the molecular formula of copper (II) iodide (A) CuI (B) Cu₂ (C) Cu₂I₂ (D) CuI₂

4. How many Hydrogen atoms are present in one mole of H₂? (A) 6.022 × 10⁻²³ g (B) 6.022 × 10²³ g (C) 1.204 × 10²⁴ g (D) 3.011 × 10²³ g

5. Which of the following compounds will show the precipitation when adding AgNO₃? (A) HF (B) K₂SO₄ (C) NaCl (D) Ca(OH)₂

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

7. Which of the following substances contains two pi bonds? (A) C₂H₄ (B) C₃H₈ (C) C₂H₂ (D) C₂H₆ (E) CH₄

8. In the molecule C₂H₄ the valence orbitals of the carbon atoms are assumed to be (A) not hybridized (B) sp hybridized (C) sp² hybridized (D) sp³ hybridized (E) dsp hybridized

9. Equilibrium is reached in chemical reactions when: (A) The rates of the forward and reverse reactions become equal. (B) The concentrations of reactants and products become equal. (C) The temperature shows a sharp rise (D) All chemical reactions stop. (E) The forward reaction stops.

10. Which of the following is the empirical formula of terephthalic acid, $\text{C}_8\text{H}_6\text{O}_4$? (A) $\text{C}_4\text{H}_3\text{O}_2$ (B) $\text{C}_8\text{H}_3\text{O}_2$ (C) $\text{C}_4\text{H}_6\text{O}_4$ (D) $\text{C}_4\text{H}_6\text{O}_4$

11. The empirical formula of a compound, $\text{CHCl}$ (Lindane), is a powerful insecticide. The molar mass of lindane is 290.8 g/mol. How many atoms of carbon does a molecule of lindane contain? (A) 3 (B) 4 (C) 5 (D) 6

12. What is the oxidation state of chromium in $\text{K}_2\text{Cr}_2\text{O}_7$? (A) 4 (B) -2 (C) 3 (D) 6

13. Consider equal mole samples of $\text{N}_2\text{O}$, $\text{Al}(\text{NO}_3)_3$, and $\text{KCN}$. Which one has the most number of nitrogen atoms in each sample? (A) $\text{N}_2\text{O}$ (B) $\text{Al}(\text{NO}_3)_3$ (C) $\text{KCN}$ (D) All are the same

14. In the reaction $\text{C(s)} + \text{O}_2(\text{g}) \rightarrow \text{CO}_2(\text{g})$ carbon is ________. (A) the reducing agent (B) the electron acceptor (C) reduced (D) the oxidizing agent (E) more than one of these

15. If n = 2, how many orbitals are possible? (A) 3 (B) 4 (C) 2 (D) 8 (E) 6

16. Which of the following bonds is least polar? (A) $\text{C—O}$ (B) $\text{H—C}$ (C) $\text{S—Cl}$ (D) $\text{Br—Br}$ (E) They are all nonpolar.

17. Which of these is an isoelectronic series? (A) $\text{Na}^+$, $\text{K}^+$, $\text{Rb}^+$, $\text{Cs}^+$ (B) $\text{K}^+$, $\text{Ca}^{2+}$, $\text{Ar}$, $\text{S}^{2-}$ (C) $\text{Na}^+$, $\text{Mg}^{2+}$, $\text{S}^{2-}$, $\text{Cl}^-$ (D) $\text{Li}$, $\text{Be}$, $\text{B}$, $\text{C}$ (E) None of these (A-D)

18. How many of the following molecules possess dipole moments?
$\text{BH}_3$, $\text{CH}_4$, $\text{PCl}_5$, $\text{H}_2\text{O}$, $\text{HF}$, $\text{H}_2$ (A) 1 (B) 2 (C) 3 (D) 4 (E) 5

19. Which of the following molecules (or ions) are nonlinear? $$\text{NO}_2^-,\quad\text{C}_2\text{H}_2,\quad\text{N}_3^-,\quad\text{HCN},\quad\text{CO}_2,\quad\text{H}_2\text{O}_2$$ (A) $\text{C}_2\text{H}_2,\ \text{HCN}$ (B) $\text{CO}_2,\ \text{N}_3^-$ (C) $\text{NO}_2^-,\ \text{H}_2\text{O}_2$ (D) $\text{N}_3^-,\ \text{NO}_2^-$ (E) all are linear

20. The bond angles about the carbon atom in the formaldehyde molecule, $\text{H}_2\text{C}=\text{O}$ , are about: (A) $120^\circ$ (B) $60^\circ$ (C) $109^\circ$ (D) $180^\circ$ (E) $90^\circ$

21. The hybridization of the central atom in $\text{O}_3$ is: (A) sp (B) sp² (C) $sp^3$ (D) $dsp^3$ (E) $d^2sp^3$

22. Which of the following does not contain at least one pi bond? (A) $\text{H}_2\text{CO}$ (B) $\text{CO}_2$ (C) $\text{C}_2\text{H}_2$ (D) $\text{C}_3\text{H}_8$ (E) All of the above (A-D) contain at least one pi bond

23. In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1? (A) The mole fraction of NaCl. (B) The mass fraction of NaCl. (C) The mass percent of NaCl. (D) The molality of NaCl. (E) All of these are about 0.1.

24. Which of the following chemical or physical changes is an endothermic process? (A) the evaporation of water (B) the combustion of gasoline (C) the mixing of sulfuric acid and water (D) the freezing of water (E) none of these

25. Rank the following compounds according to increasing solubility in water.
I. $\text{CH}_3-\text{CH}_2-\text{CH}_2-\text{CH}_3$ II. $\text{CH}_3-\text{CH}_2-\text{O}-\text{CH}_2-\text{CH}_3$
III. $\text{CH}_3-\text{CH}_2-\text{OH}$ IV. $\text{CH}_3-\text{OH}$ (A) $\text{I} < \text{III} < \text{IV} < \text{II}$ (B) $\text{I} < \text{II} < \text{IV} < \text{III}$ (C) $\text{III} < \text{IV} < \text{II} < \text{I}$ (D) $\text{I} < \text{II} < \text{III} < \text{IV}$ (E) None of these (A-D) is correct.