一、忌照“方”配药应明确实验目的化学实验可以帮助我们形成化学概念，理解和巩固化学知识。因此，实验前应认真预习实验内容，了解实验目的和实验步骤。但有少数同学把实验当成“玩”，课前不预习，心中无数，做实验时照“方”配药，手忙脚乱，对所做实验要达到什么目的全然 First, do not according to the “square” dispensing should clarify the purpose of the experiment Chemical experiments can help us to form a chemical concept, understanding and consolidation of chemical knowledge. Therefore, the experiment content should be carefully previewed before the experiment to understand the purpose of the experiment and the experimental steps. However, there are a few students who use the experiment as “playing”, do not pre-read before class, have countless hearts, and do experiments according to “square” prescriptions.