[學科] 化學
1.Arrange molecular the following substances(1 mole each) in order of
increasing entropy at 25度C: a.Ne(g) b.SO2(g) c.Na(s) d.NaCl(s) e.H2(g)
之前有看到 先比狀態 氣>液>固 再比原子數目
這樣應該為: b>e>a>d>c
但卻看到答案給:e>a>b>c>d
是答案錯了嗎??
2.A student placed a few ice cubes in a drinking water. A few minutes later
she noticed that some of the ice cubes were fused together. Explain
這題看得懂題目... 但是不知道怎麼解釋
知道的人能否解釋一下~
3.The excited melecules decay through the following parallel mechanism
: S1→(kf) S0+hv (fluorescence)
S1→(kisc) T1 (intersystem crossing)
S1→(kic) S0 (internal conversion)
the fluorescence quantum yield §f(這應該是一個很奇怪的符號 圈圈裡面有一條線)is
答案: kf/(kf+kisc+kic)
這題知道是平行反應，但是不知道為什麼，就是導不出來....
4.下列何者是零級反應:
a. thermal isomerization of cis-stilbene to trans-stilbene
b. enzyme oxidation of glucose to gluconic acid
c. decay of radioactivity of 60Co
d. decay of triplet excited C60 to ground state
e. none of the above
答案是a.
有問過人只知道，因為cd 是decay 所以是一級反應 但是我也不知道這為什麼?
但ab不知道.....
5.the standard free enery of formation of CS2(l) is 65.27 kj/mol at 298K.
this neabs that at 298K.
a.CS2(l) will not spontaneously from C(s)+2S(s)
b.CS2(l) is thermodynamically unstable
c.CS2(l) is thermodynamically stable
d.No catalyst can be found to decompose CS2(l) into its elements
e.CS2(l) has negative entropy
答案是E 不過不是很確定 我只知道d是錯的.. 感覺應該 b或c是答案..
6.Hydrogen can be made from fossil fuels in as series of two catalyzed
reactions.One of these reactions,the re-forming reaction,is
a.Zn+2HCl→ZnCl2+H2
b.CH4+H2O→CO+3H2
c.Cu(s)+2H+→Cu2+ +H2
d.CH3OH→2H2+CO
有去查re-forming 很像是再生 不過這題還是不會 答案看到是b
7.Which of the fllowing are heteogeneous alloys?
a.tin-lead solder and bronze
b.bronze
c.mercury amalgam and tin lead solder
d.coinage cupronickel
這題不知道答案...網路查也不太清楚
上面的答案是學長姐寫的 所以不太知道是否很正確
這是我寫題目累積的問題 所以蠻多的...
麻煩各位解答了
感謝~!
(PS. 有沒有辦法把考古題的照片檔案 變成可以複製的阿...XD)
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.46.36.28
討論串 (同標題文章)