课程名称︰普通化学丙 课程性质︰系定必修 课程教师︰黄志清 开课学院：工学院 开课系所︰工程科学及海洋工程学系 考试日期（年月日）︰2008/4/14 考试时限（分钟）：120min 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : A.Definition and explanation of terms.(36pt.) (1)Crystallization (2)Intermolecular attractions (3)Polar covalent bond (4)Miscible (5)Dipole moments (6)Cohesion and adhesion (7)X-ray tube (8)Amorphous (9)Light source of UV-Vis absorption spectrometer (10)Monochromator (11)Beer's Law (12)Transmittance and absorption (13)Solvation (14)Entropy (15)Colligative properties (16)Isotonic, hypotonic and hypertonic solutuons (17)Ion pair (18)Critical pressure B.Problems(60pt.) 1. Which of the following solutions is unstable? A) Dilute solution B) Unsaturated solution C) Saturater solution D) Supersaturated solution 2. Crystallization occurs from a(an)_____solution. A) saturated B) supersaturated C) dilute D) unsaturated 3. The concept like dissolves like is based on _____. A) surface tension B) viscosity C) intermolecular attraction D) molecular weight 4. Which of the following has very high solubility in water? A) C6H6 B) C2H5OH C) C6H5NH2 D) C6H5OH 5. A solution process always ______. A) decreases enthalpy B) decreases disorder C) increases disorder D) increases enthalpy 6. A solution process will be endothermic if the magnitude of the intermolecular interaction is in the order_____. A)solute-solvent>solvent-solvent B)solute-solvent<solvent-solvent and solute-solute C)solute-solvent>solvent-solvent and solute-solute 7. Which of these ionic solids would have the largest energy? A) NaCl B) NaF C) CaBr2 D) CSI E) CaCl2 8. Use the Born-Haber cycle to calculate the lattice of LiCl(s) given the following data: △H(fusion) Li=72.2 kJ/mol △H(vapor)Li=79.2kJ/mol I1(Li)=520kJ/mol Bond energy (Cl-Cl)=242.8kJ/mol EA(Cl)=348kJ/mol △Hf(LiCl(s))=-408.8kJ/mol 9. Write a Lewis structure obeying the octet rule for the phophate ion, 3- PO4 . 10. Explain why CO2 is nonpolar, but OCS is polar. - + 11. Cosider the species N2 ,N2, and N2 . Which of these species will be paramagnetic? - + + - - A. N2 and N2 B. N2 and N2 C. N2 and N2 D. Only N2 E. none are paramagnetic 12. Which of the following liquids would have the highest viscosity at 25℃? A.CH3OCH3 B.CH2Cl2 C.C2H5OH D.CH3Br E.HOCH2CH2OH 13. The atomic planes in a graphite crystal are seperated by 335 pm. At what angle would you find the first-order(n=1) diffration of 0.154 nm X-rays from a graphite crystal? 14. The molar enthalpy of vaporization of hexane(C6H14) is 28.9kJ/mol , and its normal boiling point is 68.73℃. What is the vapor pressure of hexane at 25℃? 15. Indicate all the types of intermolecular forces of attraction in CH3OH(l). 16. Platinum has a face-centered cubic crystal structure and a density 3 of 21.5 g/cm . What is the radius of the platinum atom? Pt:195.08g/mol 17. The vapor pressure of water at 20℃ is 17.5 mmHg. What is the vapor 2 pressure of water over a solution prepared from 2.00*10 g of socrose 2 (C12H22O11) and 3.50*10 g water? 18. Finding the order of osmotic pressure of the following aqueous solutions at 25℃? A. 0.2M KBr B. 0.2M ethanol C.0.1M Na2SO4 at pH 7.0 D. 0.2M KCl E. 0.1M MgCO3 at pH 5.0 F. 0.1M MgSO4 at pH 7.0 19. Finding the order of osmotic pressure of the following aqueous solutions at 25℃? A. 0.1M NaCl B. 0.1M CH3COONa at pH 3.0 C. 0.1M CH3COONa at pH 5.0 D. CH3COONa at pH 7.0 E. 0.1M sodium phosphate buffer at pH 5.0 20. When 12.1 g of the sugar sucrose(a nonelectrolyte) are dissolved in exactly 800 g of water, the solution has a freezing point of -0.082℃. What is the molar mass of sucrose ? K of water is 1.86℃/m . f C.Additional problems. 1. Draw the general molecular orbital energy level diagram for CO and calculate CO bond order.(10pt.). 2. Draw the scheme of double-beam UV-Vis absorption scanning spectroscopy(10pt.). --

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