用心 發問時間: 科學化學 · 1 0 年前

請教一些化學問題之詳解2 謝謝~

6.For a particle in a box of nanometer size,the energy level is quantized as △E=E(下標n+1)-E(下標n)=(2n+1)h^2/(8mL^2)

Use this information to quantitatively explain the flowing observations.

(a)Larger sized quantum dots emitted lights with longer wavelength.

(b)Heavy particles have larger entropy than lighter particles of the same size

of box at the same temperature.

7.沸點:NH3>SbH3>AsH3>PH3 為何錯誤?

8.Concerning vapor pressure,which of the following is not a correct statement?

9.The recombination of Br atoms 2Br(g)→2Br2(g) is considered to be and

elementary bimolecular reation.In one experiment the concentration of

bromine atoms was 1.04 X 10^(-5)M at 320μsec and the original

concentration was 12.26 X10^(-5).Find the rate constant.

Ans:27

10.the half-life of carbon-14 is 5730 years.If sample of wood has a C-14 to C-

12 ration of 0.64 times that found in a living organism.Calculate the age of

the wood.

已更新項目:

6.(a)所以Larger sized 是形容粒子大小(m值),而不是main quantum(n值)嗎?

(b) S=k lnΩ這公式是?(在什麼條件下成立?)我找不到這個...

7.bp:SbH3>NH3>AsH3>PH3 為什麼m.p卻是NH3>SbH3>AsH3>PH3 ?

8.不管這題..

9.答案有誤...我算的和小白大一樣:)

10.有點疑問C-14 to C-12 ration of 0.64 times 怎麼不是N/No=1-0.64=0.36呢

很感謝小白大幫我答覆Orz..

2 個已更新項目:

S = k lnΩ ...Boltzmann關係式...這個有點太偏太深了= =.且好像沒用到題目所給關係式

不過解了蠻多的,謝謝!

另希望下面也能解答.XD

http://tw.knowledge.yahoo.com/question/question?qi...

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