[化學] 幾題化學麻煩解惑
看板TransBioChem作者I34001019 (fuygfujhilku)時間12年前 (2012/07/03 00:02)推噓0(0推 0噓 1→)留言1則, 1人參與討論串1/2 (看更多)
1.Arrange the following according to expected value for a (pressure correction
value)in van der waal's equation. H2, N2, CH4,Ne,H2O (96成大)
答案為 H2O>N2>CH4>H2>Ne 我自己的答案 H2O>N2>CH4>Ne>H2 (用HB和分子量比出來)
2.Which substance will have the highest entropy? (96中興)
A) Butane B) Isobutane C) Isopentane D)Pentane E) Neopentane
答案為 D 我毫無頭緒 =..=
3.Compound 1 has a composition of 46.7 mass% of element A and 53.3mass% of
element B . A and B also form a second binar compound (compound2).If the
composition of the two compounds are consistent with the law of multiple
proportions ,which of the following composition could be that of compound2?
A)23.4 mass%A;76.6 mass %B B)30.4 mass%A;69.6 mass%B (97成大生科)
C)33.3 mass%A;66.7 mass %B D)53.3 mass%A;46.7 mass%B
E)73.3 mass%A;26.7 mass %B
答案為 C 毫無頭緒 =..=
4.Which of the following statements about orbital energies is correct?
(97成大生蚵)
D) The splitting of sublevels in many-electron atoms is explained in terms
of the penetration effect.
E) The energy of a given orbital increases as the nuclear charge Z increases.
答案為D 我答案寫E 因為我想說E=-K Z^/N^ 如果Z越大 E就越負 代表能量越小
5. 2NO + O2 -> 2NO2 97成大化工的計算最後一題
他問d[NO2]/dt=?
經一番計算後我求出其R=K[NO]^[O2]
那答案 是否為 " 2 K[NO]^[O2]"??
6. What is the formula for the compound that crystallizes with a face-centered
cubic unit cell of sulfur ions ,and that contains zinc ions in half of the
tetrahedral holes?
答案為 ZnS
我想說 Zn = 4 然後S = 4/2=2(half of tetrahedral holes)
= Zn2S
7.The observed color of Ti(H2O)6 3+ is violet. What wavelength do you expect
to have an absorption maximum on an UV-VIS spectrum?
A) 400 B)570 C)650 D)700
答案為D
我想說 觀察的顏色是紫色 那吸收的顏色必為紫色的互補色 (黃色)
然後我就選波長大的 700
8.Which electron on an atom of copper would have the highest value of W
in the Boltzmann formula?
A) 3s B)3d C)4s D)4p
答案是 b 我毫無頭緒-.-
9 Which of the following atoms would be most reactive with water at room
temperature?
A)K B)Na C)Mg D)Ca E)Li
答案為E 我答案寫A 我覺得答案怪怪= =?
10.The color of RS-Hb and O2-Hb are green and red,respectively
Which absorbs higher frequency of electromagnetic radiation?
答案為 RS-Hb
我想說 看到綠光 吸收光為互補色紅色 (f較小)
看到紅光 吸收光為互補色綠色 (f較大)
故我答案寫 O2-Hb
11. 比較Na2S K2S Rb2S Cs2S 的 lattice energy
答案為 Na2S>K2S>Rb2S>Cs2S 他是用電荷密度來比較
但我印象中 LE是和"鍵能"成正比的 水和能才是和"電荷密度"成正比
故我比較他們的離子鍵強度
推出 Na2S<K2S<Rb2S<Cs2S (有極化現象)
難道我記錯了嗎??
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 122.120.66.185
→
07/03 00:24, , 1F
07/03 00:24, 1F
討論串 (同標題文章)