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在2005年高考化学试题中,以乙炔为背景的试题出现的比较多,重点考查了学生对乙炔的性质及实验室制法的理解和应用．为便于学生对这方面知识的理解和掌握,笔者就有关乙炔的高考化学试题进行归纳分析,供大家参考．一、乙炔的考点归纳 1．乙炔的分子结构电子式:H:C(?)C:H;结构式:H-C≡C-H, 4个原子在同一条直线上．乙炔分子中有C≡C 叁键存在,在化学反应中C≡C叁键有2个易断裂． 2．乙炔的物理性质乙炔俗称电石气,纯净的乙炔是无色无味
In the 2005 college entrance examination chemistry test questions, there are many questions on the background of acetylene, focusing on the students’ understanding of the nature of acetylene and the understanding and application of laboratory methods. In order to facilitate the students’ understanding and mastery of this knowledge, the author conducts an analysis of the chemistry test questions related to acetylene for reference. 1. Test sites for acetylene are summarized. The molecular structure of acetylene is electronic: H:C(?)C:H; structural formula: H-C?C-H, with 4 atoms on the same line. There are C≡C叁 bonds in acetylene molecules, and there are 2 easily broken C≡C叁 bonds in chemical reactions. 2. The physical properties of acetylene Acetylene commonly known as calcium carbide gas, pure acetylene is colorless and odorless