[化學] 台大普化B 96~100 共7題
以下這幾題，是我目前仍然不太會算的題目:
1.A gas sample containing of CO2 and N2 in 1:2 molar ratio has a volume of
。
350ml at 40 C with a CO2 partial pressure of 560 torr. What is the
volume of the mixed gases under STP condition ?
。
2.The decomposition of dimethyl ether , (CH3)2O , at510 C is a first-order
process wuth a rate constant of 6.8*10^-4 s^-1.
(CH3)2O (g) -->CH4 (g) + H2 (g) + CO(g)
If the initial pressure of (CH3)2O is 135 torr , how long will it take
when the pressure of (CH3)2O drops to 51 torr ?
(A)17.9 s (B)1020 s (C)1430 s (D)1.23*10^5 s
3.Consider the equilibrium :N2O4 (g) <---> 2NO2 (g)
del H = 58.0 KJ , which of the following will shift the equilibrium to the
right ?
(A) A catalyst is added to the system.
(B) N2 is added at constant volume. (我是這個選項不會 XDD")
(C) The volume is decreased.
(D) The temperature is increased.
。 。
4.At 25 C , E cell = 1.47 V for the voltaic cell:
2+ 2+
V (s) | V (1M) || Cu (1M) | Cu (s)
(A)V (s) is the anode.
(B)V (s) is the negative electrode. (正負極我常搞混 ，怎麼簡單扼要判斷呢?!)
(C)Electrons flow from V (s) to Cu (s).
(D)The cell potential (E cell) of the reaction is zero at equilibrium.
5.Which of the following involve(s) in an increase in the entropy of the
system ?
(A)grinding a large crystal of KCl to powder (這選項的意思，不是很懂@@")
(B)Br (g) -> Br2 (l)
(C)O2(298K) -> O2(373K)
(D)NH3 (1atm , 298K) -> NH3 (3atm , 298K) (這個講一下好了^^)
(E)mixing benzene with toluene (Both have similar intermolecular forces)
( (E)選項還是無法理解!!)
6.Which of the following statements is(are) true ?
+
(A) O2 would give a bond order of 2.5
(B) C2 is diamagnetic
(C) Six electrons are involved in pi ponding in benzene , C6H6
+ -
(D) N-O bond length NO < NO2
2-
(E) The carbon-carbon bond in C2 is stronger than the one in CH3CH3
7.Which of the following statements related to alkali metals and
alkaline earth metals are incorrect?
(A)Thay can all be obtained via electrolysis of their molten salts.
(B)Their oxides can all be dissolved in the strong acid.
(C)Their carbonate salts are all fairly soluble in water.
(D)Their ions present in water are all colorless and not reactive.
(E)Alkaline earth metals can form compounds of oxidation numbers
2
+1 and +2 , because of the presence of ns electrons in their
outer shells.
(上面這題我一直不知道正解到底是什麼?!XDD")
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