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2006年4月20日～24日,在烟台龙口召开的全国实验区高中化学新课程实施成果交流会上,安排了17节观摩课,8个模块的内容都有。其中南京市金陵中学李惠娟老师上的必修1模块的《铁与生命力》使我感触颇深,现把其上课的情景复述于下。课堂实录上课后李老师首先和学生共同探讨了 Fe~(2+)在生命活动中的生理功能,用多媒体展示出血红蛋白携氧示意图,指出人体如果缺铁就可能出现缺铁性贫血,就应当补铁。接着她用多媒体展示了补铁的一种药品,屏幕上显示的是“速力菲——琥珀酸亚铁片”。老师让学生思考:能否用已学的知识检验“速力菲”是否含有铁元素?是 Fe~(2+)吗?同学们就开始思考,设计方案。同学1:将药片溶于水加氢氧化钠溶液,若先出现白色沉淀,然后变成灰绿色,最后变成红褐色,则证明该药含 Fe~(2+)。同学2:药片溶于水后加 KSCN 溶液,再加氧化剂若出现血红色物质,则证明该药含 Fe~(2+)。
April 20, 2006 ~ 24, held in Longkou, Yantai National Experimental Zone high school chemistry new curriculum implementation exchange meeting, arranged for 17 observation class, 8 modules have content. One Nanjing Jinling High School Li Huijuan teacher compulsory 1 module “iron and vitality,” I feel quite deep, now the scene of his class repeat in the next. Class Record After class, Teacher Li first discussed the physiological function of Fe ~ (2+) in life activities and showed a schematic diagram of hemoglobin carrying oxygen by multimedia. He pointed out that iron deficiency anemia may occur in human body if it is iron deficiency, Iron supplement. Then she used multimedia to show a kind of iron-supplements medicine, the screen shows “speed Philippine - ferrous succinate ”. The teacher asked the students to think: Can we use the knowledge we have learned to test? “Speed Philippine ” contains iron? Is Fe ~ (2+)? Students began to think, design. Students 1: The tablets dissolved in water plus sodium hydroxide solution, if the first white precipitate, and then turn gray green, and finally into a red-brown, then prove that the drug containing Fe ~ (2+). Classmate 2: KSCN solution dissolved in water after the tablets, plus the oxidant if the blood red substance, then prove that the drug contains Fe ~ (2+).