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教学目标1.了解纯水与自然水的区别;2.了解自来水生产流程,理解吸附、沉淀、过滤和消毒等净水的方法;3.认识水资源的宝贵,养成节约用水的好习惯。教学重点理解吸附、沉淀、过滤和消毒等净水的方法。教学难点过滤操作方法。活动准备学生分组实验用品:纸杯、半截塑料瓶(瓶盖有孔)、吸管、蓬松棉、纱布、小卵石、细沙、木炭、天然污水。教师演示实验用品:烧杯、漏斗、滤纸、铁架台、玻璃棒、明矾、活性炭、天然污水、红墨水。
Teaching Objectives 1. To understand the difference between pure water and natural water; 2. Understand tap water production process, to understand the adsorption, sedimentation, filtration and disinfection of water purification methods; 3. Recognize the precious water resources, to develop good habits of water conservation. Teaching emphasis on understanding adsorption, precipitation, filtration and disinfection and other water purification methods. Teaching difficult to filter operation method. Activities Preparation Student groups Experimental supplies: paper cups, half plastic bottles (holes with caps), straw, fluffy cotton, gauze, pebbles, fine sand, charcoal, natural sewage. Teachers demonstrate experimental supplies: beaker, funnel, filter paper, iron stand Taiwan, glass rods, alum, activated carbon, natural sewage, red ink.