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除杂题是中考化学的热点,也是教师教学和学生学习的难点。物质的除杂就是将混合物中的某组分用物理或化学的方法除去而得到相对纯净的物质。首先我们来分析两道2015年中考中出现的除杂题。
Removal problem is a hot chemical examination in the school, but also teaching teachers and students learning difficulties. Material removal is the removal of a mixture of components by physical or chemical methods to get relatively pure material. First of all, let us analyze two problems in the 2015 midterm exam.