作者livelygirl (隐身术)
看板TransBioChem
标题[化学] 请帮我同学解答
时间Tue Mar 13 23:28:50 2012
因为我同学是偷偷准备转学考~所以不知道能问谁
请各位高手相救!
1.Which one of the following decreases as the strength of the attractive
intermolecular forces increases? (A) The heat of vaporization. (B) The normal
boiling temperature. (C) The vapor pressure of a liquid. (D) The sublimation
temperature of a solid.
2.Calculate the pH of a solution made by mixing 50.0 mL of 0.400 M NaA (Ka
for HA = 1.0 10-8) with 50.0 mL of 0.100 M HCl.
(A) 3.65 (B) 7.52 (C) 8.48 (D) 11.6.
3. Determine the pH of a solution prepared by mixing the following:
25.0 mL of 0.200 M HCl
7.50 mL of 0.100 M NaOH
50.0 mL of 0.200 M NaH2PO4
For H3PO4 Ka1 = 7.5 10-3, Ka2 = 6.2 10-8, and Ka3 = 4.8 10-13
(A) 2.65 (B) 4.56 (C) 5.32 (D) 6.73.
4-5.You make a cell with a copper electrode in a solution of copper nitrate
and a silver electrode in a solution of silver nitrate.
4.If you could increase the concentration of Ag+, which of the following is
true about the cell potential?
(A) It would increase. (B) It would decrease.
(C) It would remain constant. (D) Cannot be determined.
5.If you could increase the concentration of Cu2+, which of the following is
true about the cell potential?
(A) It would increase. (B) It would decrease.
(C) It would remain constant. (D) Cannot be determined.
6.The ionization energy of H atom is 13.6 eV. What is the second ionization
energy of He atom?
(A) 6.8 eV (B) 13.6 eV (C) 27.2 eV (D) 54.4 eV
7. What is pOH of a solution prepared by mixing 0.30 mol of HCN and 0.5 mol
of NaCN? (pKa = 9.4 )
(A) 7.00 (B) 10.9 (C) 3.36 (D) 4.38
8.Sodium lamps are very common used for lighting. What is the wavelength of
sodium lamp?
(A) 489 nm (B) 589 nm (C) 689 nm (D) 789 nm
9.Which of the following metal ions has the largest reduction potential?
(A) Ag+ (B) Ni2+ (C) Ca2+ (D) Fe2+
谢谢大家的帮忙 :)
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2F：→ biup2:搜寻字串"wavelength" 03/14 21:12
3F：→ biup2:7. [H+]=Ka*(acid/salt), pH=-log[H+], pOH=14-pOH 03/14 21:14
4F：→ biup2:2.先把HCl用完，剩下的东西再用[H+]=Ka*(acid/salt) 03/14 21:17
5F：→ biup2:1.分子间作用力上升，举例来说：水的H bond 03/14 21:19
6F：→ biup2:如果要增加分子间距离，也就是固→液→气这个方向的变化 03/14 21:21
7F：→ biup2:需要额外支付更多能量去破坏分子间作用力 03/14 21:21
8F：→ biup2:致使熔化、汽化、昇华的温度提高 03/14 21:22
9F：→ biup2:4/5不太记得了，我猜是AC 03/14 21:33
10F：→ confused7749:也许biup2不小心打错了 第三行pOH=14-pH 03/14 23:55
11F：→ biup2:那是国中理化了，这种东西就算不更正也看得懂我要写啥 03/15 00:48
12F：→ confused7749:喔 我是想说原PO会看不懂 不是很想找别人的错误 03/15 00:52