[化學] 請幫我同學解答

[livelygirl (隱身術)]

因為我同學是偷偷準備轉學考~所以不知道能問誰
請各位高手相救!

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+


謝謝大家的幫忙 :)

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※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 120.126.232.166
→ biup2:http://en.wikipedia.org/wiki/Sodium-vapor_lamp
→ biup2:搜尋字串"wavelength"
→ biup2:7. [H+]=Ka*(acid/salt),   pH=-log[H+],    pOH=14-pOH
→ biup2:2.先把HCl用完，剩下的東西再用[H+]=Ka*(acid/salt)
→ biup2:1.分子間作用力上升，舉例來說：水的H bond
→ biup2:如果要增加分子間距離，也就是固→液→氣這個方向的變化
→ biup2:需要額外支付更多能量去破壞分子間作用力
→ biup2:致使熔化、汽化、昇華的溫度提高
→ biup2:4/5不太記得了，我猜是AC
→ confused7749:也許biup2不小心打錯了 第三行pOH=14-pH
→ biup2:那是國中理化了，這種東西就算不更正也看得懂我要寫啥
→ confused7749:喔  我是想說原PO會看不懂 不是很想找別人的錯誤