2005年全国高中生化学竞赛试题中无机化学基础题的难度与以往相比,难度略有加大, 出题方式和形式在继承传统的前提下,范围更广一些,涉及的知识更接近于新课标下的教材实际,更适用于考查基础和能力相结合的原则, 也有利于学生综合素质的提高,下面是本次考试第1题的分析与解答,通过它可以帮助我们提高思维能力和分析问题能力．题目白色晶体X是用浓硫酸与尿素反应产生的．X不含结晶水,不吸潮,易溶于水,摩尔质量小于100 g／mol．用途广泛,如造纸、纺织、电镀、水处理的有机合成等．野外地质人员 Compared with the past, the degree of difficulty in basic chemistry of inorganic chemistry in the National Senior High School Students Chemistry Test in 2005 was slightly more difficult. Under the premise of inheriting the tradition, the ways and forms of the questions were more extensive and the knowledge involved was closer to new The actual teaching textbooks, more applicable to test the basis and ability to combine the principles, but also conducive to improving the overall quality of students, the following is the examination of the first question of analysis and answers, through it can help us to improve thinking skills and Analyze problem ability. White crystal X is produced by the reaction of concentrated sulfuric acid with urea. X does not contain crystal water, does not absorb moisture, easily soluble in water, the molar mass is less than 100 g / mol. Wide range of uses, such as paper, textile, electroplating, water treatment, such as organic synthesis. Field geologists