課程名稱︰普通化學乙下
課程性質︰系定選必修
課程教師︰簡淑華
開課學院：生農學院
開課系所︰森林環資系
考試日期（年月日）︰2007/4/25
考試時限（分鐘）：兩節課
是否需發放獎勵金：是
試題 :
1.Briefly define,explain or distinguish the following terms:
(1)paramagnetic materials and diamagnetic materials
(2)valence band and conduction band
(3)diamonde structure and zinc-blende structure
(4)n-type semiconductor and p-type semiconductor
(5)solvent and solute
(6)state function and path function
(7)Le Chatelier's Principle
2.Arrange in order of decreasing the specified properties:
(1)band gap:ZnO,CdO,Nbo
(2)crystal Lattice Enthalpy:LiF,LiCl,LiBr,LiI
(3)solubility in water:Fe(OH)2,Fe(OH)3
(4)solubility in water:NaCl,AgCl,AgBr,AgI
(5)frequency of light:red,yellow,blue
(6)electronegativity:N,As,P,F
3.State the three laws of thermodynamics and indicate which state function
is mainly concerned in the law. Also show the first law by using an
equation.
4.Concerning the Harber-Bosch process for synthesis of ammonia from nitrogen
and hydrogen,
(1)Write the chemical equation
(2)Given the value of equilibrium constant Kc is 9.60 at 300C,
what is the value of Kp
(3)Calculate △H,△S,and △G at 25C by using the thermodynamic data given
below.
entropy in J/K N2(g),191.61 H2(g),130.68 NH3(g),192.45
enthalpy of formation ,△Hf[NH3(g)]=-46.11 KJ/mole
(4)Calculate the equilibrium constant K at 25C
(5)From a thermodynamic point of view,is the reation spontaneous at room
temperature.
(6)Is the reactiond driven by enthalpy,entropy,or both?
(7)At what temperture for K=1
(8)Does high temperature make the reaction more or less spontaneous?
(9)Does high pressure enhance formation of ammonia?
(10)Predict the effect of a ten-fold increase of pressure on the composition
of the ammonia synthesis at equilibrium.
5.Answer the following:
(1)Predict whether the band gap in GaAs is large or smaller than that of GaP.
Give your reason and explain the following color variation:
Composition Emission Color
GaP0.40As0.60 red
GaP0.65As0.35 orange
GaP0.85As0.15 yellow
GaP1.00As0.00 green
(2)Explain equlitatively why the endothermic decomposition of calcium carbonate
to calcium oxide and carbon dioxide is spontaneous at high temperture but
not at room temperture.
(3)Determine the combustion enthalpy per gram for methane and methanol.
Which fuel is more efficient?
Given △Hf[CH4(g)]=-74.6KJ/mole; △Hf[CH3OH(l)]=-239.2KJ/mole
△Hf[CO2(g)]=-393.5KJ/mole; △Hf[H2O(l)]=-285.8KJ/mole
H=1.008 C=12.011 O=15.9994 amu
(4)Explain why HF etches glass and determine whether HCl does as well.
Given △Gf[SiO2(s)]=2856.64KJ/mole ; △Gf[HCl(aq)]=-131.23KJ/mole
△Gf[HF(aq)]=-278.9KJ/mole ; △Gf[SiF4(g)]=-1572.65KJ/mole
△Gf[SiCl(g)]=-616.98KJ/mole ; △Gf[H2O(l)]=-237.13KJ/mol
(5)Determine the pH of 0.010M NaOH solution.
(6)Determine the solubility of Ca3(PO4)2 and calcium concentration in water
Given Ksp=1.0*10^-25
(7)A solid forms when 0.001 mole Na2SO4 is added to 1 L of 0.5mM Ba(NO3)2.
What is the composition of the solid? What is the concentration of barium
in the saturated solution?
Given Ksp(BaSO4)=1.08*10^-10
(8)Determine the pH of a 1M solution of acetic acid.(Ka=1.8*10^-5)
(9)What is buffered solution? Write the Henderson-Hasselbalch equation.
(10) A buffered solution with NaHCO3 and H2CO3 can be responsible for
maintaining the blood at pH of 7.3~7.5 ,what [sate]/[acid] ratio
is required? Given Ka1(H2CO3)=4.3*10^-7
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