课程名称︰普通化学丙 课程性质︰共同必修 课程教师︰杨吉水老师 开课学院： 开课系所：护理学系 物理治疗系 职能治疗系 考试日期（年月日）︰2008/10/22 考试时限（分钟）：120分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : General Chemistry-Mid-Term I. （2008/10/22）（3Pages） 答案必须写於专用答案纸上，则以零分计算 A. 是非题（正确画○，错误画，每题二分，选七题作答，共十四分） 1. Molecular oxygen is a diradical species. 2. For the cleavage of a covalent bond in the gas phase, the heterolytic cleavage is more favorable than honolytic one. 3. The carbon in CO2 is sp^2 hybridized. 4. The C-H bond length in ethane（C2H6）is longer than that in ethene（C2H4）. 5. The red color region in an electrostatic potential map means electron_poor region. 6. CCl4 is a polar molecule. 7. HgCl2 is more toxic than Hg2Cl2, because it is more soluble in water. 8. Bleaching makes use of redox reactions to decolorize materials. 9. For a reaction having an equilibrium constant K equal to 1, the dG（delta G）value is zero. 10. Ni is a good catalyst for the reaction of addition od H2 to the carbon-carbon double bonds in vegetable oils. B. 单一选择题（每题三分，选十题作答，共三十分） 1. An atom with Z = 26 and A = 58 contain __ protons, __ electrons, and __ neutrons. （A）26; 26; 58（B）58; 26; 26（C）26; 26; 32（D）32; 26; 32（E）26; 32; 84 2. What is the electron configuration of Fe? （A）1s^2 2s^2 2p^6 3s^2 3p^6 3d^8 （B）1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^6 （C）1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^6 （D）1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 （E）1s^2 2s^2 2p^6 3s^2 3p^6 3d^6 3. Element in Period 3 or below don't always "obey" the octet rule because they （A）can only use 9 orbitals for bonding. （B）can use s and p orbitals for bonding. （C）can use s, p, and d orbitals for bonding. （D）cannot use d orbitals forbonding. （E）cannot use s orbitals forbonding. 4. Which formula is least likely to represent a molecular compund that really exists? （A）C2H6（B）Br3Cl5（C）PCl5（D）SF4（E）SF6 5. All of the statements regarding redox reactions are true except （A）A reducing agent causes another substance to be reduced. （B）Halgens usually behave as oxidizing agents because they readily gain electrons. （C）Metal ions are produced when pure metals are oxdized. （D）When a substance is oxidized its charge ( or oxidation number ) decreases. （E）Alkali metals often behave as reducing agent because they readily lose electrons. 6. Which set of properties would identify an unknown white solid as a molecular compound? I. Contains a metal. II. Has a definite crystal structure. III. Dissolves in water, but not in organic liquids. IV. Melts at 80C. V. Does not conduct electricity when melted. （A）I III（B）I II V（C）III（D）II IV V（E）II III IV V 7. When the reaction shown is balanced, there are __ atoms of oxygen and __ atoms of hydrogen on each side. （A）6; 11（B）16; 18（C）8; 14（D）4; 7（E）16; 28 8. Which sample contains the largest number of ions? （A）1.0mol (NH4)3PO4 （B）1.5mol AgNO3 （C）1.0mol NaNO3 （D）1.0mol Fe(NO3)2 （E）1.5mol SnCl2 9. Consider the reaction shown: 2CO (g) + O2 (g)→CO2 (g) +135.2 kcal/mol The reaction is __ because the sigen of dH（delta H） is __. （A）Endothermic; negative （B）Exothermic; positive （C）Endothermic; negative （D）Exothermic; negative （E）Exothermic; neither positive nor negative 10. All of the statements regarding the symbol dG（delta G） are true except （A）It refers to the free energy of the reaction. （B）It allows us to predict the spontaneity of a reaction. （C）It allows us to identify an exothermic reaction. （D）It allows us to identify an endergonic reaction. （E）It describes the effect of both enthalpy and entropy on a reaction. 11. A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy （A）could occur at low temperature, but not at higher temperature. （B）could occur at high temperature, but not at lower temprature. （C）could not occur regardless of temperature. （D）could occur at any temperature. （E）non of the above. 12. 2Al2O3 (s)→4Al (s) +3O2 (g) dG（delta G）= +138kcal/mol （A）spontaneous: increases （B）spontaneous: decreases （C）non-spontaneous: increases （D）non-spontaneous: decreases （E）non-spontaneous: does not change C. 简答题（每大题六分，选六大题作答，共三十六分） 1. Name the following cations: （a）Ag+（b）Fe3+（c）Cu+ 2. Name the following anions: （a）CN-（b）H2PO4-（c）CH3COO- 3. Name the following substances: （a）Na2Cr2O7（b）Ba(MnO4)2（c）Ca(OH)2 4. Draw two major Lewis resonance structures for each of the following molecules or ions: （a）Ozone, O3（b）Formate ion, HCO2-（c）Thiocyanate ion, SCN- 5. Name the following compounds: （a）OSO4（b）BF3（c）SiCl4 6. Balance the following equations: （a）(NH4)2Cr2O7 (s) → Cr2O3(s) + H2O(g) + N2 (g) （b）Zn (s) + MnO2 (s) + NH4Cl(s)→ ZnCl2(aq) + Mn2O3 (s) +NH3 (aq) +H2O (l) （c）NO2 (g) + O2 (g)→ N2O5 (g) 7. Arrange the following molecules on order of increasing acidity" H2O, HF, HBr. NH3, CH4 8. Arrange the following bonds in order of increasing bond dissociation energy: Si-F, C-C, Si-Si, Si-O D. 简答题（每大题十分，选两大题作答，共二十分） 1. Draw the energy diagrams for exergonic reactions that meet the following descriptions: （a）a slow reaction that has a small free-energy change. （b）a fast reaction that has a large free-energy change. 2. （a）Balance the following equation NH3 (g) + O2 (g) → NO (g) + H2O (g) + heat and explaing the effect on the equilibrium of the reaction （b）Raising the pressure （c）Adding NO (g) （d）Decreasing the concentration of NH3 （e）Lowering the temperature 3. （a）Sketch the shape of 1s and 2p orbitals. （b）Sketch the covalent bonds od ethene（CH2=CH2）by using ovelapped aomic orbitals. Over, Good Luck! Key to the Questions A. ○╳╳○╳╳○○○○ B. BCBCBDDCEDCBC C. 1. (a) Silver(Ⅰ) ion (b) ferric ion or iron(Ⅲ) ion (c) cuprous ion or copper(Ⅰ) ion 2. (a) Cyanide ion (b) Dihydrogen phosphate ion (c) Acetate ion 3. (a) Sodium dichromate (b) Barium permanganate (c) Calcium hydroxide 4. 略 5. (a) Osmium tetroxide (b) Boron trifluoride (c) Silicon tetrachloride 6. (a) (NH4)2Cr2O7 (s) → Cr2O3 (s) + 4H2O +N2 (b) Zn (s) + 2MnO2 (s) + 2NH4Cl (s) → ZnCl2 (aq) + Mn2O3 (s) + 2NH3 (aq) +H2O (l) (c) 4NO2 (g) + O2 (g) → 2N2O5 (g) 7. CH4 < NH3 < H2O < HF < HBr 8. Si-Si < C-C < Si-O < Si-F D. 1. 略 2. (a) Balance the following equation 4NH3 (g) + 5O2(g) → 4NO (g) + 6H2O (g) + heat and explain the following effects on the equilibrium of the reaction: (b) Raising the pressure ← (c) Adding NO (g) ← (d) Decreasing the concentration of NH3 ← (e) Lowering the temperature → 3. 略 喔！好多！终於打完了！有误的话我会再更正的。 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 218.169.123.207 ※ 编辑: popojjdd 来自: 218.169.123.207 (10/25 20:37)