109年 - 109 國立高雄大學_碩士班招生考試_化學工程及材料工程學系：普通化學#103239

選擇題 (20)

1. The element lithium (Li) exists as two stable isotopes, 6Li (isotopic mass = 6.200 amu) and 7Li (isotopic mass = 7.200 amu). Lithium has an atomic mass of 7.125 amu. What is the percent abundance of 7Li ?(A) 7.5 % (B) 22.3% (C) 90.2% (D) 92.5% (E) none of these

2. A chemical engineer dilutes a stock solution of hydrochloric acid (HCl) by adding 25.0 m3 of 7.50 M acid to enough water to make 500 m³ . What is the mass (in g) of HCl per liter of the diluted solution? (Mw(HCl) = 36.46 g/mol)(A) 13.7 (B) 12.1 (C) 0.567 (D) 0.0136 (E) none of these

3. A rigid plastic container holds 45.5 g of methane (CH4) at a pressure of 820 torr. What is the pressure (torr) if 3.5 g of methane is removed at constant temperature? (A) 723 (B) 757 (C) 808 (D) 794 (E) none of these

4. Which of the following statements is true? (A) The number of neutrons is the same for all neutral atoms of an element (B) Alkali metals form ions with a 2+ charge when they react with nonmetals. (C) The molecule SO2 has two resonance structures. (D) The total energy of the universe decreases, while the entropy decreases. (E) none of these

5. In a hydrogenation reaction, ethene (C₂H₄) and H₂ from ethane (C₂H₆). If 137 kJ is given off per mole of C₂H₄ reacting, how much heat (kJ) is released when 12.6 g of C₂H₆ forms? (Mw(C₂H₆) = 30.07 g/mol) (A) 57.4 (B) 28.7 (C) 14.4 (D) 0 (E) none of these

6. Balance the following redox equation using the smallest integers possible and select the correct coefficient for the HI.

(A) 1 (B) 2 (C) 4 (D) 7 (E) none of these

7. Which of the following statements is incorrect? (A) NF3 is a polar molecule. (B) The hybridization of the central atom is sp³ in ? (C) According to the molecular orbital model, the bond order of P₂ molecule is three. (D) A material is made from Al, Ga, and As. The mole fraction of each element is 0.25, 0.26, and 0.49, respectively. This material would be an p-type semiconductor. (E) none of these

8. Which of the following electron configurations belongs to an atom that is most likely to be involved in a covalent bond? (A) 1s² 2s² 2p⁶ 3s² (B) 1s² 2s² 2p⁶ 3s² 3p³ (C) 1s² 2s² 2p⁶ (D) 1s² 2s² 2p⁶ 3s² 3p⁶ (E) none of these

9. Select the correct name for the following compound. (A) 3-ethyl-2,3-dimethyl-1-propanol (B) 2,3,4-trimethyl-1-butanol (C) 2,3-dimethyl-1-pentanol (D) 3,4-dimethyl-5-pentanol (E) none of these

10. A certain gas expands in volume from 1.0 L to 2.0 L at constant temperature. Calculate the work done by the gas if it expands against a vacuum. (1 Latm = 101.3 J). (A) +202.6 J (B) -101.3 J (C) +101.3 J (D) 0 J (E) none of these

11. Which of the following statements about voltaic (galvanic) and electrolytic cells is correct? (A) The anode will definitely gain weight in a voltaic cell. (B) Oxidation occurs at the cathode of both cells. (C) The free energy change, G, is negative for the voltaic cell. (D) The electrons in the external wire flow from cathode to anode in an electrolytic cell. (E) none of these.

12. Calculate E°cell and indicate whether the overall reaction shown is spontaneous or
nonspontaneous.

Overall reaction:
(A) = -2.891 V, nonspontaneous (B) = -2.891 V, spontaneous(C) = 2.891 V, nonspontaneous (D) = 2.891 V, spontaneous
(E) none of these

13. Formic acid (HCOOH) has a . What is the in a solution that is initially 0.10 M formic acid? (A) (B) (C) (D) (E) none of these

14. When a weak acid is titrated with a strong base, the pH at the equivalence point? (A) is less than 7.0 (B) is equal to 7.0 (C) is greater than 7.0 (D) is equal to the pKa of the acid (E) none of these

15. What elements are alloyed to make stainless steel? (A) Fe and C (B) Fe and Mn (C) Fe and Zn (D) Fe, V and Zn (E) Fe, Cr and Ni

16. 30.0 mL of a 0.100 mol/L solution of a metal ion is mixed with 30.0 mL of a 0.100 mol/L solution of a ligand L. A reaction occurs in which the product is . Approximately, what is the maximum concentration of , in mol/L, which could result from this reaction? (A) 0.0250 (B) 0.250 (C) 0.180 (D) 0.0125 (E) none of these

17. Which one of the following statements about solid Cu (face-centered cubic unit cell) is incorrect? (A) The solid has a cubic closest-packed structure. (B) The number of atoms surrounding each Cu atom is 12. (C) There are two atoms per unit cell. (D) The length of a face diagonal is four times the Cu radius. (E) none of these.

18. What is the molecular shape of BrF5 as predicted by the VSEPR theory? (A) Trigonal bipyramidal (B) Square planar (C) T shaped (D) Seesaw (E) none of these

19. The rate expression for a particular reaction is rate = k[A]2 [B]. If the initial concentration of B is increased from 0.1 M to 0.4 M, the initial rate will increase by which of the following factors? (A) 2 (B) 4 (C) 8 (D) 16 (E) none of these

20. For the reaction (unbalanced), what volume (mL) of a 1.25 M solution of FeCl2 is required to react completely with molecules of O₂? (A) 76.5 (B) 38.3 (C) 125.2 (D) 57.4 (E) none of these

申論題 (4)

＜ II ＞計算題

(1) For the process

, ΔH° = 31.0 kJ/mol and ΔS° = 93.0 J/Kmol. What is the normal boiling point (K) of liquid Br2?

(2) Find the solubility of solid in a 0.025 M NaF solution.

(3) Methane (CH₄) reacts with chlorine gas (Cl₂) form chloromethane (CH₃Cl), as the following equation；

When 20.5 g of methane and 45.0 g of chlorine gas undergo a reaction that has a 65% yield. What mass of the chloromethane (CH₃Cl) forms? (Mw(CH₄) = 16.04 g/mol, Mw(Cl₂) = 70.90 g/mol, Mw(CH₃Cl) = 50.48 g/mol)

(4) Given the following reactions of nitrogen oxides and their standard enthalpy changes,

Calculate the heat of reaction for

109年 - 109 國立高雄大學_碩士班招生考試_化學工程及材料工程學系：普通化學#103239

試卷資訊

選擇題 (20)

申論題 (4)