課程名稱︰普通化學乙下 課程性質︰必帶 課程教師︰牟中原教授 開課學院：理學院 開課系所︰材料系 考試日期（年月日）︰99/5/18 考試時限（分鐘）：110(10:20~12:10) 是否需發放獎勵金：yes （如未明確表示，則不予發放） 試題 : 1.A cellulose is a kind of carbohydrates. If 200.0ml of aqueous solution containing 1.500g of cellulose at 300K gives rise of a osmotic rise of solution level of h=20.4 cm, calculate the molecular weight of this cellulose assume the density of the solution is 1.000 g/cm3 (12%) 2.Complete and bakance the following reactions. (18%) a. Rb(s)+H2O(l)--> b. Na2O2(s)+H2O(l)--> c.LiH(s)+H2O(l)--> d.KO2(s)+H2O(l)--> e.PbS+O2--> f.BF3+NH3--> 3.Gallium oxide is an amphoteric oxide and In2O3 is a basic oxide. Write equations describing reactions that illustrate these properties. Explain the difference from the electronic structure. (10%) 4.The compound VCl4 undergoes dimerization in soloution 2VCl4<-->V2Cl8 When 6.6834 g of VCl4 is dissolved in 100.0 g of canbon tetrachloride, the freezing point i slowered by 5.97 K. Calvulate the value of equilibrium constant for the dimerization reaction.(density of the mixture is 1.696 g/cm3, Kf=29.8Celsius kg/mol) (15%) 5.Explain (a) the term azeotrope (b)"non-ideal solution" and (c) why the azeotrope could be formed in an non-ideal solution. Please draw the temperature-composition diagram. (14%) 6.We are concerned about materials production, explain how the following materials can be obtained its source: (16%) (a)Magnesium from sea water (b)Graphene(draw its structure) from silicon carbide (c)Ammonium nitrate from N2. All the nitrogen has to be from the air. (d)Phosphoric acid from P4 7.Explain the term "reverse osmosis". When we want to obtain pure water from a salty solution of 1.2M NaCl, how much pressure we need to put across the membrane? (15%) --

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