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新课标高考理综(Ⅱ)卷第28题是以探究无机物质组成为线索,以化学实验为研究方法,以考查学生对实验原理的理解,实验方法的运用,实验基础知识、化学计算、化学技能的掌握为目的的典型试题。该试题很好地体现了考试说明中的命题指导思想,体现了高中化学课程的“宽基础、厚实践、重能力”的特征。题目某小组以CoCl2·6H2O、NH4Cl、H2O2、浓氨水为原料,在活性炭催化下,合成了橙黄色晶体X。为测定其组成,进行如下实验。1氨的测定:精确称取wg X,加适量水溶解,注入如图1所示的三颈瓶中,然后逐滴加入足量10%NaOH溶液,通入水蒸气,将样品液中的
The new curriculum standard college entrance examination science (Ⅱ) Volume 28 is to explore the composition of inorganic substances as a clue to chemical experiments as a research method to examine students’ understanding of experimental principles, the use of experimental methods, experimental basic knowledge, chemical calculations, Chemical skills for the purpose of the typical test questions. The test questions reflect well the guideline of the proposition in the test description and embody the characteristics of “wide foundation, thick practice and heavy ability” of high school chemistry course. Title A group of CoCl2 · 6H2O, NH4Cl, H2O2, concentrated ammonia as raw material, catalyzed by activated carbon, the synthesis of the orange-yellow crystal X. To determine its composition, the following experiment was carried out. 1 Determination of ammonia: Weigh accurately wg X, add the appropriate amount of water dissolved, into the three-necked flask as shown in Figure 1, and then by adding a sufficient amount of 10% NaOH solution, access to water vapor, the sample solution