課程名稱︰普通化學甲
課程性質︰高中生預修及台大學生非系定必修普化甲專班
課程教師︰蔡蘊明
開課學院：理學院
開課系所︰化學系
考試時間︰11/29/2006
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
R=0.08206 liter*atm*deg^(-1)*mol^(-1)=8.3145 J*deg(-1)*mol^(-1)
1.Give the systematic name of each of the following compounds: (5%)
(a) KIO3 (b) Na2HPO4 (c) HNO2 (d) Na2SO3 (e) Fe(NO3)3
2.Write formulas for the following compounds: (5%)
(a) Stannous chloride (b) Cupric nitrate (c) Hypobromous acid
(d) Tin(IV) fluoride (e) Potassium cyanide
3.Gallium consists of 60.% Ga(69) and 40.% Ga(71). Arsenic has only one
naturally occuring isotope, As(75). The mass spectrum of Gallium arsenide
shows fragments with formulas GaAs and Ga2As2. What would the distribution
of peaks look like for these two fragments? (5%)
4.Balance th following equation using the half-reaction method:(Show your
steps) (10%)
basic
Fe(CN)6^(4-)(aq)+Ce^(4+)──→Ce(OH)3(s)+Fe(OH)3(s)+CO3^(2-)(aq)+NO3^(-)(aq)
5.Consider three identical flasks filled with different gases. (6%)
Flask A: CO at 760 torr and 0℃
Flask B: N2 at 250 torr and 0℃
Flask C: H2 at 100 torr and 0℃
(a) In which flask will the molecules have the greatest average kinetic
energy?
(b) In what flask will the molecules ave the greatest root mean square
velocity?
(c) Which flask will have the greatest number of collisions per second with
the walls of the container?
6.The effusion rate of an unknown gas is measured and found to be 25.44mL/min.
Under identical experimental conditions the effusion rate of O2 is found to
be 30.50mL/min. Which of the following is the unknown gas: CH4, CO, NO, CO2
or NO2? (4%)
7.Which of the following gases would you expect to have the largest value of
the van der Waals constant b: H2, N2, CH4, C2H6 or C3H8? Explain your answer.
(5%)
8.Calculate the [H+] of a 1.0*10^(-7) M solution of NaOH in water. (10%)
9.The gas arsenide, AsH3, decomposes as follows: (5%)
2AsH3(g)<==>2As(s)+3H2(g)
In an experiment pure AsH3(g) was placed in an empty, rigid, sealed flask at
a pressure of 392.0 torr. After 48h the pressure in the flask was observed to
be constant at 488.0 torr.
(a) Calculate the equilibrium pressure of H2(g).
(b) Calculate Kp for this reaction.
10.Calculate the [H+] of a 4.0*10^(-5) M solution of phenol in water.
(Ka=1.6*10^(-10)) (10%)
11.Calculate [H+] for a 0.100M solution of NaH2PO4 (Ka1=7.5*10^(-3),
Ka2=6.2*10^(-8), Ka3=4.8*10^(-13)). (5%)
12.Consider the titration of 100.0mL of a 0.100M solution of the hypothetical
weak acid H3X (Ka1=1.0*10^(-3), Ka2=1.0*10^(-7), Ka3=1.0*10^(-12))with 0.100
M KOH. Calculate the pH of the solution under the following conditions:
(a) after 50.0mL of 0.100M KOH has been added (1%)
(b) after 100.0mL of 0.100M KOH has been added (1%)
(c) after 150.0mL of 0.100M KOH has been added (1%)
(d) after 200.0mL of 0.100M KOH has been added (1%)
(e) after 250.0mL of 0.100M KOH has been added (1%)
(f) after 300.0mL of 0.100M KOH has been added (5%)
13.An aquaeous solution contains a mixture of 0.0500M HX(Ka=1.77*10^(-4)) and
0.150M HY(Ka=1.34*10^(-5)). The pH of this solution was found to be 2.492.
Determine the percent of dissociation of the two acids at this point. (4%)
14.Why should we avoid adding excess amount of indicator for acid-base
titration? (6%)
15.The copper(I) ion forms a chloride salt that has Ksp=1.2*10^(-6). Copper(I)
also forms a complex ion with Cl^(-):
Cu^(+)(aq)+2Cl^(-)(aq)<==>CuCl2^(-)(aq) K=8.7*10^4
Calculate the solubility of copper(I) chloride in 0.10M NaCl. (5%)
16.What is the pI of lysine. (5%)
(+)H3N─(CH2)4─CH(NH3+)─COOH ←pKa=2.2
↑pKa=10.5 ↑pKa=9.0
(Doubly protonated lysine)
試題結束
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