作者tom5707 (孤单漂流．孤单行)
看板b982040XX
标题[公告] 农化题目
时间Tue May 11 23:07:23 2010
他们存docx档~我把她打在这里
1.Describe a method to remove SO2 from the exhaust from fossil fuel burning.
ANS：CaCO3(s) →(加热) CaO(s) + CO2(g)
CaO(s) + SO2(g) → CaSO3(s)↓
2CaO(s) + SO2(g) + O2(g) → 2CaSO4(s)↓
2.The half-life of Rn-222 is 3.8 days. Starting with the radioactivity level
of 10 pC due to Rn-222, how long is it before the radioactivity level
decreases to 4 pC, the up-limit value recommended by EPA?
( pC means 3.70*10^-2 disintegrations of radioactive nuclei per second.)
ANS：10 pC (1/2)^(t/3.8)=4 pC
t=5.0 days
3.Explain why photochemical smog is often with reddish color? (Hint: The
color is due to a certain product in reaction.)
ANS：The reddish color of photochemical smog is due to the red color of NO2(g).
N2(g)+O2(g) → 2NO(g)
2NO(g) + O2(g) → 2NO2(g) (Red)
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※ 编辑: tom5707 来自: 219.68.89.38 (05/11 23:07)
1F：推 Qrangelee516:最後一行应该是2NO(g)+O2(g)→2NO2(g)吧~ 05/11 23:55
2F：推 SWW :橘子好聪明~ 05/12 00:00
3F：推 alex514103 :O2可能转换成能量了 05/12 00:16
※ 编辑: tom5707 来自: 219.68.89.38 (05/12 01:02)
4F：推 ken2002cool :英文出题唷 这麽猛 05/12 14:05
5F：推 SWW :老师规定的 05/12 22:42