作者acXD (黑特魂)
看板Chemistry
標題[問題] 幾個物化觀念題
時間Tue Feb 2 14:56:23 2010
1. When a reaction reaches equilibuirm at a temperature, then
the entropy change of the system is zero.
我寫○ 但是看到的答案是X
2. Select correct statements for "fugacity" and "activity":
(a) Fugacity is a kind of "fictitious" pressure used for real gases
in order to retain simple forms of equations that are applicable
for real gas only.
(b) Fugacity is defined as the ratio between the actual pressure and
the pressure in the ideal gas.
(c) Activity is defined as the ratio between the actual fugacity and
the fugacity in the standard state.
(d) In the standard state, fugacity is always equal to unity.
(e) In the standard state, activity is always equal to unity.
我的認知是這樣
對real gas來說 activity = fugacity = γ*P(real)
所以這題我選 a c e 但是答案是 b c d ?
3. The large increase in the rate of a reaction on rise in T is due to
(a) The lowing of activation energy
(b) The decrease in mean free path
(c) The increase in collision frequency
(d) The increase in the number of molecules having more than the
threshold energy.
我選 b c d 但是答案只有 d
T上升的話 mean free path 跟 clollision freqyency都會增加
跟反應速率沒有關係嗎? @@
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◆ From: 140.113.123.233
1F：推 h888512:總S=0 02/02 15:09
2F：→ h888512:動態平衡 可能還是會有Heat transfer 所以系統或環境個別 02/02 15:09
3F：→ h888512:的entropy change可能不等於零 02/02 15:10
4F：→ x06Cc:3.應該是單選題，使反應速率增加的最大原因是d 02/02 22:43
5F：→ x06Cc:降低平均自由路徑，碰撞頻率增加都只是次要因素 02/02 22:45
6F：→ x06Cc:主要原因是因為能量夠的粒子變多造成有效碰撞的機會變多 02/02 22:46
7F：→ x06Cc:這統熱應該有解釋，不過年代久遠了有點忘了Orz 02/02 22:47