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课程标准、教材以及学生分析:课程标准(2011版)对“水的净化”的要求:(1)知道硬水与软水的区别;(2)了解吸附、沉降、过滤和蒸馏等净化水的常用方法;(3)初步学习使用过滤的方法对混合物进行分离。教材设计了三个实验:蒸发水、鉴别硬水和软水、过滤,介绍了硬水的危害、过滤的操作流程和要领、活性炭的吸附功能、蒸馏水的制作原理。学生对水很熟悉,对饮用水的来源也有耳闻,但对于“水的净化”具体方法、硬水和软水的区别等专业知识却并不了解。
Course Standards, Textbooks, and Student Analysis: Curriculum Standard (2011 Edition) Requirements for “Purification of Water”: (1) Know the difference between hard and soft water; (2) Understand purified water such as adsorption, sedimentation, filtration and distillation Commonly used methods; (3) Preliminary study using filtration method to separate the mixture. Teaching materials designed three experiments: evaporation of water, identification of hard and soft water, filtration, introduced the hazards of hard water, filtration processes and essentials, adsorption of activated carbon, distilled water production principles. Students are familiar with water and have heard about the sources of drinking water. However, they do not understand the specific methods of “water purification” and the distinction between hard water and soft water.