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【题目】回答下列问题:

(1)从鸡蛋白的溶液中提取蛋白质的方法有________和________。

(2)鸡蛋腐烂时,常闻到有刺激性气味的气体,该气体主要是________,说明蛋白质中含有________元素。

(3)误食重金属盐会中毒,这是因为_________________。

(4)浓硝酸溅到皮肤上,使皮肤呈现________色,这是由于浓硝酸和蛋白质发生了________反应的缘故。

(5)鉴定一种织物的成分是真丝还是人造丝,可各取一小块进行________,这是因为______________________。

【答案】(1)盐析 渗析

(2)H2S

(3)重金属盐会使蛋白质变性

(4)黄 颜色

(5)灼烧 真丝是蛋白质,灼烧时有烧焦羽毛的气味

【解析】(1)提取蛋白质的方法可以从两方面考虑,一是让蛋白质沉淀出来,一是让其他物质分离出去;(2)鸡蛋腐烂时,蛋白质分解放出的硫化氢气体具有刺激性气味;(3)重金属离子会使蛋白质变性;(4)蛋白质可与浓硝酸等许多试剂发生特殊的颜色反应;(5)人造丝是合成纤维,真丝是蛋白质,两者灼烧时的气味不同。

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