(三)NO与O2同时通入水中
2NO+O2＝2NO2，3NO2+H2O＝2HNO3+NO。总反应方程式为：4NO+3O2+2H2O＝4HNO3。当体积比：V(NO)︰V(O2)＜4︰3时，余O2；V(NO)︰V(O2)＝4︰3时，恰好完全反应；V(NO)︰V(O2)＞4︰3时，余NO。
[思考感悟]溴蒸气与NO2都是红棕色气体，说出一种简单的鉴别方法？
溶于水后生成的气体及溶液均无色的为NO2，溶液呈橙黄色的为溴蒸气。或通入AgNO3溶液，产生浅黄色沉淀的是溴蒸气，无沉淀的是NO2。
[基础训练]
1、发射“嫦娥”一号环月卫星运载火箭的推进剂引燃后，产生大量高温气体从尾部喷出。该气体主要成分是CO2、H2O、N2、NO等，在发射现场可看到火箭尾部产生大量红棕色气体，其原因是( B )
A、高温下N2遇空气生成NO2 B、NO遇空气生成NO2
C、CO2与NO反应生成CO和NO2 D、NO与H2O反应生成H2和NO2
2、上世纪80年代后期人们逐渐认识到，NO在人体内起着多方面的重要生理作用。下列关于NO的说法不正确的是( D )
A、NO分子中有极性共价键 B、NO是造成光化学烟雾的因素之一
C、NO是汽车尾气的有害成分之一 D、NO分子所含电子总数为偶数
3、某校化学兴趣小组的同学在实验中发现工业硝酸呈黄色，他们查阅资料后找到这样解释：工业硝酸呈黄色是由于NO2溶于浓硝酸引起的。“这个解释对吗？”，他们决定进行探究，请填写空白。
(二)NO2和O2混合气体溶于的计算
由4NO2+O2+2H2O＝4HNO3可知，当体积比：V(NO2)︰V(O2)＜4︰1时，O2过量，剩余气体为O2；V(NO2)︰V(O2)＝4︰1时，恰好完全反应；V(NO2)︰V(O2)＞4︰1时，NO2过量，剩余气体为NO。
(一)NO2或NO2与N2(非O2且不溶于水)的混合气体溶于水
可依据3NO2+H2O＝2HNO3+NO，利用气体体积差值进行计算。
20.-How did you do in the driving test yesterday?
-I had a narrow ______. My month-long practice gave me some comfort.
A. chance B. surprise C. hope D. pass
19.To save some of the human languages before they are forgotten, the students in our school started a discussion “Save Our ________”
A. Sky B. Life C. Arts D. Voices
18.-- Were you given a(n) ________ or did you have to do it?
-- Well, you can never tell.
A. chance B. responsibility C. choice D. opportunity
17.Many graduates in China do their best to go abroad to seek their.
A. fate B. chance C. luck D. fortune
16.This research has attracted wide _______ coverage and has featured on BBC television’s Tomorrow’s World.
A. message B. information
C. media D. data
15.That ______ makes the heart grow fonder means the being away from someone you love makes you love them more.
A. presence B. absence C. shortage D. lack
14. The task wasn’t worth our efforts at all. It made little ______ no matter how hard we worked.
A. effect B. use C. result D. difference