17 If the ionization energy for hydrogen atom is X,what is the energy released
for the transition n=4->n=2?
(A)X/4 (B)3X/6 (C)X/2 (D)3X/4
20 Which of the following has the least effect on the solubility of a solid
in a liquid?
(A)temperture (B)nature of solute (C)nature of solvent (D)pressure
27 Which oligonucleotide can form a double-strand structure in aqueous
solution?
(A)AGTCGACT (B)AAAAGGGG (C)ACATTACA (D)TCTCTCTC
IV.The freezing point(in 度C)of anthracene in benzene can be represent by
5.5-5m,where m is the molality of anthracene.
(a)What is the freezing point of pure benzene?
(b)What is the value of Kf for benzene?
(c)If a solution consisting of 1.5g anthracene and 100g benzene has a
freezing point of 5度C, what is the molecular weight of anthracene?
求求會的高手指點一下
不過我沒有答案,可不可以附答案給我
任何一題都好
謝謝看題目的人和回答的人
謝謝~~
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