作者yang770610 (扬)
看板TransBioChem
标题Re: [化学] 98嘉义大学转学考 普通化学
时间Thu Jul 16 15:48:19 2009
※ 引述《sugarlesss (girl)》之铭言:
: 考完刚到家! 来问几题一直耿耿於怀的问题><
: 1. Three flasks, 1.0L , STP, A装:He B: O2 C: H2
: How many of the flasks at STP are less dense than air at STP ?
: 2. The majority of shell electron transition in molecules occur in the _____
: region of the electromagnetic spectrum
: A) IR B) X rays C) UV D) microwave
: 3. 电池 Cu^2+ + 2Ag → 2Ag^+ + Cu
: 请问分别加 Ag^+ 或 Cu^2+ 会影响 cell potential 吗?
: 4. An ideal gas expands to the vacuum isothermally and irreveribly
: W is A) <0 B) >0 C) =0 D) more imformation is needed
: △U is A) <0 B) >0 C) =0 D) more imformation is needed
: △G is A) <0 B) >0 C) =0 D) more imformation is needed
: △Ssys is A) <0 B) >0 C) =0 D) more imformation is needed
恒温不可逆膨胀
恒温内能=0
而不可逆
G大於0(这里没注明是不是系统的自由能,有争议)
Ssys>0
膨胀做负功
所以W<0
以上
: 以上,请求板大解惑!
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1F:→ JL12:凡自发过程必不可逆,故G<0 07/16 23:50