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【简答题】
教育部制订的《义务教育化学课程标准（2011年版）》指出：化学是一门以实验为基础的学科，在教学中创设以实验为主的科学探究活动，有助于激发学生对科学的兴趣，引导学生在观察、实验和交流讨论中学习化学知识，提高学生的科学探究能力。 问题： （1）请列举初中化学3个最基础的化学实验。 （2）通过“粗盐提纯”实验，简要说明过滤应注意的问题。 （3）除了过滤之外，请列举初中化学3个最基本的化学实验技能。
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