1. Colored gases include: F2 (light * 1 *), Cl2 (yellow green), Br2 (gas, red brown), NO2 (red brown); Other gases are colorless.
2、但凡可溶于水或许可跟水反响的气体都具有安慰性气息;如有安慰性气息的有:HX、NH3、SO2、NO2、F2、Cl2、Br2(气)
3、但凡有很强的复原性而又溶于水或许能跟水起反响的气体都具有特别难闻的安慰性气息。如H2S
4、易溶于水的有:NH3、HF、HCl、HBr、HI、NO2、SO2;微溶于水的有:CO2、Cl2、H2S、Br2(气)
5、 有毒的有:F2、HF、Cl2、H2S、SO2、CO、NO、HBr、Br2(气)和NO2。
6、易液化的有:NH3、Cl2、SO2。
7、在空气中易形成白雾的有:HCl、HBr、HI。
8、在常温下,由于发作化学反响而不能共存的有:H2S跟Cl2、HI跟Cl2、NH3跟HCl、Cl2跟HBr、F2跟H2。
9、其水溶液呈酸性(能使紫色石蕊试液变白色)的有:HF、HCl、HBr、HI、H2S、SO2、CO2、NO2、Br2(气);紫色石蕊试液先变红,后褪色的有:Cl2;可使湿润的白色石蕊试纸变蓝色的有:NH3。
10、有漂白作用的气体有:Cl2(湿润的)、SO2、O3(很少考到);
11、使少量廓清石灰水变混浊的有:CO2、SO2
12、能使无水CuSO4由白色变蓝色的有:H2O(气)
13、在空气中可以熄灭的有:H2、CH4、C2H2、C2H4、CO、H2S;在空气中扑灭后,火焰呈浅蓝色的有:CH4、CO、H2;
14、显示氧化性的有:F2、O2;通常显示氧化性的有:Cl2、Br2(气);显示复原性的有:H2S、H2、CO、NH3、HI、HBr、HCl;既可显示氧化性,又可显示复原性的有:Br2、SO2、NO2、N2。
15、不能用浓硫酸枯燥的有:H2S、HI、NH3、C2H2、C2H4;不能用碱石灰枯燥的有:HX、X2、SO2、H2S、CO2;不能用无水氯化钙枯燥的有:NH3
16、跟水可发作反响的有:F2、Cl2、NO2、Br2(气)、CO2、NH3;其中Cl2、F2、NO2、Br2(气)跟水的反响属于氧化复原反响
17、能使湿润的碘化钾淀粉试纸变蓝的有:Cl2和Br2(气)
18、遇AgNO3溶液可发生沉淀的有:Cl2、HCl、Br2(气)、HBr、HI、H2S和NH3(少量)
19、能使溴水和酸性KMnO4溶液褪色的有:H2S、SO2、C2H2、C2H4;
20、由于化学性质稳定,通常用作保护气的有:N2、Ar和Ne
21、制得的气体通常为混合物的是:C2H4、C2H2;
This article is from:http://www.newstar-china.com/
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