某无色混合气体可能由CH4、NH3、H2、CO、CO2和HCl中的某几种气体组成。在恒温、恒压的条件下,将此混合气体通过浓硫酸时,总体积基本不变;通过澄清石灰水,未见变浑浊,但混合气体的总体积减小,把剩余气体导出后,在O2中能够点燃,燃烧产物不能使CuSO4粉末变色。则混合气体的成分是
A.一定有HCl、CO、CO2,可能有H2 | B.一定有HCl、H2、CO,可能有CH4 |
C.一定没有CH4、NH3、CO2,可能有CO | D.一定有HCl和CO,可能有CO2 |
更新时间:2016-11-28 12:52:55
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B.CO和CO2分别通入澄清石灰水 |
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【推荐1】Sulfur dioxide(二氧化硫)is an important compound in its own right。It is used in the manufacture of paper。When made from wood pulp or from other materials,paper is usually pale yellow in colour。 Sulfur dioxide is used to bleach(漂白)it to the white colour which is needed。Sulfur dioxide is used in preference to chlorine as it is less harmful to the environment。Sulfur dioxide is also used in the food industry。It is used to kill bacteria in foods to prevent them from ‘going bad’。Examples of foods where it is used include dried apricots(杏脯) and wine。
When concentrated,sulfuric acid(硫酸)is very dangerous。It is a powerful dehydrating agent and oxidizing agent and can cause very severe burns。
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(1)To bleach paper to the white colour,Sulfur dioxide is a better choice than chlorine because 。
(2)The following are the properties of concentrated sulfuric acid,except for 。
(3)Dehydration is a process of the removal of water,or the elements of water,from a substance。Here,dehydration means in Chinese。
When concentrated,sulfuric acid(硫酸)is very dangerous。It is a powerful dehydrating agent and oxidizing agent and can cause very severe burns。
The dehydrating properties of the concentrated acid can be demonstrated in the laboratory by its reaction with sugar。Sugar is a carbohydrate-it contains carbon,hydrogen and oxygen。The concentrated acid removes the hydrogen and oxygen as water,leaving carbon behind。The acid will dehydrate other carbohydrate materials,such as paper,clothing and wood,in a similar way。When dilute,sulfuric acid is safer,but it is still a strong acid with normal acid properties。
(1)To bleach paper to the white colour,Sulfur dioxide is a better choice than chlorine because 。
A.it is less harmful to the environment |
B.It is cheaper than chlorine |
C.It is easier to prepare than chlorine |
A.a powerful dehydrating agent | B.a powerful oxidizing agent |
C.Food preservatives(防腐剂)used in the food industry |
A.脱氢 | B.脱水 | C.脱氧 |
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