課程名稱︰普化丙
課程性質︰
課程教師︰鄭淑芬
開課系所︰機械系
考試時間︰2006年 6月8日
試題 :
Single Choice Questions:
14% 2 points per question
1. The degradation of phosgene(COCL2)(g) into CO(g) and Cl2(g) happens to
be nonspontaneous at room temperature and standard state conditions
(273K,1atm). What change in temperature must occur to make this a
spontaneous reaction?
(a) increase T
(b) decrease T
(c) add CO to the COCl2
(d) there is insufficient data to answer
2. Two 6.5L flasks are joined by a 150ml tube with a stop cock. If 0.25 moles
of nitrogen are held in the left flask and the right flask is empty , what
happens to the entropy of the system upon opening the valve between the
flasks?
(a) The entropy increases
(b) The entropy remains the same
(c) The entropy decrease
(d) There is too little information to asssess the change
3. Without detailed calculations, predict the sign of △S for the system for:
Fe(s) + 2HCl(g) → FeCl2(s) + H2(g)
(a) positive
(b) negative
(c) zero
(d) too little information to access the change
4. Consider the elementary step: A+B→C. What type of elementary step is this?
(a) unimolecular
(b) bimolecular
(c) termolecular
(d) first order
5. The unit of second order rate constant is
(a) M/s
(b) 1/s
(c) 1/(M.s)
(d) 1/(M^2 .s)
6. The conjugate base of ammonium chloride is :
(a) NH3
(b) HNO2
(c) HCl
(d) HNO3
7. Which of the following is a weak acid?
(a) NH3
(b) HClO
(c) HCl
(d) HNO3
(27%, 3 points per question)
8. Calculate △S for the reaction:
2SO2(g) + O2(g)→2SO3(g)
S in J/mol K for SO2(g)= 248.1, SO3()256.6, O2(g)= 205.0
(a) -537 J/mol K
(b) +145 J/mol K
(c) -188 J/mol K
(d) +547 J/mol K
9. The production of nitric oxide is governed by the reaction:
4NH3(g) + 5O2(g)→ 4NO(g) + 6H2O(g)
If the rate at which oxygen is consumed is 8.29x10^-3 mol/L.s ,
what rate is NO produced?
(a) 8.29x10^-3 mol/L.s
(b) 1.04x10^-2 mol/L.s
(c) 6.63x10^-3 mol/L.s
(d) 5.53x10^-3 mol/L.s
10. The decompositon of hydrogen peroxide (H2O2) into O2(g) and liquid H2O
produced the following data:
time(min) 10.0 20.0 30.0 40.0 60.0
O2 volume(ml) 67.2 147 304 628 2769
What is the average rate of the reaction at 35.0 minute?
(a) 6.72 mL/min
(b) 10.1 mL/min
(c) 7.98 mL/min
(d) 15.7 mL/min
11. If the decomposition of reaction A folllows first-order kinetics, what
concentration of A remains if : [A]0 =0.273 M , k=1.53x10^-2 min^-1 ,
and the elapsed time = 1.61h
(a) 0.009M
(b) 0.0623M
(c) 0.197M
(d) 0.0273M
12. What is the molar solubility of CaF2 (Ksp=3.9x10^-11)?
(a) 6.24x10^-6 M
(b) 4.41x10^-6 M
(c) 2.14x10^-4 M
(d) 9.27x10^-5 M
13. What is the pH of a 0.150 M NaOH solutinon ?
(a) 0.82
(b) 3.05
(c) 11.66
(d) 13.18
14. Which species listed below is present in greatest concentration in 1.0 M
solution of NH4NO3 ? (Kb of NH3 = 1.8^10-5)
(a) NH4+
(b) NO3-
(c) OH-
(d) NH3
15. The synthesis of the pesticide thionyl chloride (OSCl2) proceeds according
to: SO3(g) + SCl2(l) ←→ OSCl2(l) + SO2(g)
If △G =106 kJ/mol for this reaction at 298k , what is the Keq at this
temperature? (R=8.314J/mol.K)
(a) 7.21x10^12
(b) 3.50x10^14
(c) 3.81x10^18
(d) 1.19x10^20
16. From the values given for △H and △S at 298K, which of the following
reactions is spontaneous under standard conditions at 298K?
(a) 2POCl3(g) → 2PCl3(g) + O2(g) △H=572kJ and △S=179J/K
(b) N2(g) + 3F2(g) → 2NF3(g) △H=-249kJ and △S=-278J/K
(c) N2(g) + 3Cl2(g) → 2NCl3(g) △H=460kJ and △S=-275J/K
(d) N2F4(g) → 2NF2(g) △H=85kJ and △S= 198J/K
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