Re: [化學] 中興化學問題

看板TransBioChem作者water0bearer (霖)時間13年前 (2011/07/02 21:59)推噓11(11推 0噓 16→)

留言27則, 2人參與討論串2/2 (看更多)

※ 引述《sparkle0829 (sparkle)》之銘言： : ...... : 98.3. Consider the following chemical reaction: 2A + 2B → C Overall reaction : Reaction mechanism: Step1. A+B→D : Step2. D+B→M : Step3. A+M→C : Which one of the following rate laws is consistent with this mechanism? : (A) Rate = k[A]^2 [B] (B) Rate = k[D][B] (C) Rate = k[A][B] : (D) Rate = k[A] [B]^2 (E) The information is not sufficient : →請問這樣列是錯哪? : Step3: K2 = [M]/[D][B] ; K1 = [D]/[A][B] ; [M]=K2[D][B]=K2K1[A][B]^2 : Rate[C] = K3[A][M] = K1K2K3 [A]^2 [B]^2 我認為是E，不知道哪一部是速率決定步驟~ : 98.6. Gasoline was injected into the cylinder and was ignited. A piston moved : outwardly of the cylinder while exposition took place inside the motor : engine. Which of the following statements is not accurate ? : (A) It is an example of converting chemical energy to mechanical work. : (B) The motor engine had done work to the surrounding. : (C) The temperature dropped down after the piston moved out. : (D) All the energy released from the burning of gasoline was converted : to the work done to the surrounding. : (E) It was an irreversible process. : →是否選E,不可逆表自發,但其被ignite才氣體膨脹？ E是對的，答案我認為應該是D。現實生活中幾乎所有的反應在熱力學夏都是不可逆的(不能回到原本的狀態)。引擎燃燒爆炸有一大部分的能量變成熱能散失到surrounding，並沒有全部用來做功! : 98.10. Which of the following statements is wrong about thermodynamics ? : (A) The entropy of any substance(element or compound)in its equilibrium : state approaches zero at the absolute zero of temperature. : (B) The absolute value of the Gibbs free energy of a substance can't : be determined. : (C) The Gibbs free energy is zero during phase transitions of a pure : substance. : (D) The absolute value of the entropy of a substance can't be : determined. : (E) A spontaneous process is always an irreversible process. 我猜是C，相變化自由能會變吧! : 95.29. What is W in Boltzmann's formula, S=k x InW : (A) a fraction indicating the probability of obtaining a result : (B) a random number : (C) the number of ways of obtaining the state : (D) the work times Avogadro's number : →請問這定律是？應該是A，普化課本有這個方程式，我記得~ 你可以查看看書本後面的字母索引! : 94.18. If the temperature of the reaction is decreased, what is the effect on : the equilibrium constant and ΔG ? : N2(g) + 3H2(g) → 2NH3(g),ΔH+ = -92.4 kJ/mol : (A) K increases, ΔG increases : (B) K decreases, ΔG decreases : (C) K increases, ΔG decreases : (D) K decreases, ΔG increases : (E) Temperature does not affect equilibrium or ΔG : →請問G是？1. K↑,G= -RTlnK (兩個變因 T↓K↑) : 2. K↑,G= H-TS, T減少到負值，此時G↑ 故選A？ K會上升你知道， G的部分我認為這個反應在低溫會趨向自發，所以溫度越低ΔG應該愈來愈小~ : 94.非選擇題1. Please describe how to set up the physical structure of atom using the : experimental findings. : 題目有點多T_T 今天被教授劣退有請各位大大幫忙了!感恩!! 抱歉~目前手邊沒有計算紙與筆，也沒有普化課本，先回答你這樣，沒回答的另請高手幫忙~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.128.67.245

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