吸烟有害健康,科学实验表明香烟所产生的烟雾中至少有300种化合物

吸烟有害健康,科学实验表明香烟所产生的烟雾中至少有300种化合物不同程度地对人体有害。为了鉴定该烟雾中是否存在CO2和CO,在对香烟燃烧产生的烟雾进行适当处理后依次通过足量的以下试剂:①澄清石灰水,②浓H2SO4,③灼热的黑色氧化铜粉末,④澄清石灰水,发现①④澄清石灰水变浑浊,其他无明显现象。试回答:

(1)①中现象说明                                         

(2)烟雾中是否存在CO?                         ,作出此判断所依据的实验现象为                                 

(3)③中无明显变化的原因可能是                                 

答案

解析:①中石灰水变浑浊说明存在CO2的同时也可将其除掉,④中又出现浑浊现象说明是在③中CO被氧化生成CO2,而③中却未看到CuO(黑色) Cu(红色),说明烟雾中必存在O2,借助于CuO,O2把CO氧化生成CO2气体。

答案:(1)该烟雾中含有CO2  (2)存在  ④中澄清石灰水变浑浊  (3)CO还原CuO,得到的Cu又被氧化,故看不到CuO变色

相关题目

下列关于化学键的说法正确的是(    ) A.构成单质分子
下列关于化学键的说法正确的是(    ) A.构成单质分子的微粒一定含有共价键B.全部由非金属元素组成的化合物不一定是共价化合物C.非极性键只
(10分)在标准状况下,将CO2 与CO的混合气(其质量为同状况下等
(10分)在标准状况下,将CO2 与CO的混合气(其质量为同状况下等体积氢气质量的16倍)充满盛有足量过氧化钠的容积为2.24L的密闭容器内。(设固体物质的体积
— Dear, what time is the flight to Beijing on Saturday? — Wait a minute. Le
— Dear, what time is the flight to Beijing on Saturday? — Wait a minute. Let me _______ in the schedule(时刻表). A. look at it       B. look for it          C. look after it 
Mr. King works very long hours every day. He usually gets up at 5:30. He brushes
Mr. King works very long hours every day. He usually gets up at 5:30. He brushes his teeth quickly and goes to his workplace (工作地点). Then he runs with some kids. After that he takes a shower.
向三份0.1mol·L-1 CH3COONa溶液中分别加入少量NH4NO3、Na2SO3、FeCl2
向三份0.1mol·L-1 CH3COONa溶液中分别加入少量NH4NO3、Na2SO3、FeCl2固体(忽略 溶液体积变化),则CH3COO- 浓度的变化依次为 A.减小、增大、减小        B
Scientists are convinced ___________ the positive effect of laughter __________
Scientists are convinced ___________ the positive effect of laughter ___________ physical and mental health. A. of; at    B.  by; in     C. of; on     D. on; at
Frank Woolworth was born in Rodman, New York, in 1852. His family were very poor
Frank Woolworth was born in Rodman, New York, in 1852. His family were very poor farmers, and there was never enough to eat. Frank decided he did not want to be a farmer. He took a short business cou
下列物质中铁的质量分数最小的是    A.FeO          B. F
下列物质中铁的质量分数最小的是    A.FeO          B. Fe3O4      C.FeS        D.Fe2O3

最新题目