Question

怎样用化学方法将空气、氮气、二氧化碳、氧气4瓶失去标签的气体鉴别出来？                                  

                                                                                                  

                                                                                                       

                                                                                                     

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Answer 1

将点燃的木条分别伸入四瓶气体中，木条没有明显变化的空气，木条燃烧更旺的是氧气，木条熄灭的是二氧化碳或氮气；再将余下的两瓶分别加入澄清的石灰水，变浑浊的是二氧化碳，没有浑浊的氮气。