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深圳市化学一模分析会暨专家讲座之专家示范课

  • 2026-04-03 20:25:23
深圳市化学一模分析会暨专家讲座之专家示范课

      为深入做好高三年级第一次调研考试质量分析,精准指导高考二轮复习备考工作,切实提升教师备考教学能力与专业素养,深圳市教育科学研究院邀请新安中学特级教师、正高级教师兰建祥老师在深圳外国语学校高中部给全市老师们开展一节高三二轮复习专家示范课。

专家示范、尽显功力

       兰建祥老师二轮复习课主题为《金属离子萃取剂与萃取平衡》,以层层递进、引导学生自主建构知识的教学思路,呈现了一堂高质量的备考示范课。课堂以学生熟悉的四氯化碳萃取碘实验为切入点,自然过渡到金属离子萃取的核心内容,整体教学分为三个层层递进的环节。

环节1

建构酸性萃取剂的核心原理

      兰老师引导学生从萃取的基本作用力切入,自主梳理出配体解离、配位结合、相转移三个关键过程。以苯酚类萃取剂为例,师生共同探究配体为何需解离出氢离子并以阴离子形式存在,从极性、电荷、静电作用与配位能力四个维度总结规律,帮助学生完整建构酸性萃取剂的作用机制,形成可迁移的认知模型。

环节2

迁移应用,自主解释碱性萃取剂机理

      在掌握酸性萃取原理的基础上,兰老师创设新情境:面对四氯合铁等金属阴离子配离子,如何实现萃取?他放手让学生运用已建构的认知模型自主分析、表达,学生自然迁移思路,顺利解释三丁基有机碱先质子化形成阳离子,再与金属阴离子通过静电作用形成中性离子对的过程。整环节以学生自主推导为主,教师仅作点拨与归纳,充分体现以学为中心的课堂理念,最终共同提炼出碱性萃取剂的作用特点。

环节3

联系工业实际,对接高考备考

     兰老师以二氧化锗萃取提纯工业案例为载体,引导学生将两类萃取原理应用于真实分离情境,实现理论与实践的深度融合。最后结合深一模试题进行反思提升,帮助学生站在原理高度重新审视考题,实现知识理解与学科能力的同步升华。

      整堂课结构清晰、逻辑严谨,以“模型建构—迁移应用—真实情境落地”为核心脉络,充分展现了特级教师精湛的教学设计与以学生为主体的教学理念,为高三化学复习课提供了优秀范例。

学习感悟与专家点评

1

一线老师学习感悟

      高级中学青年教师饶勇与深圳外国语学校教师苏玉婵分享了聆听兰老师这节课的学习感悟。他们均表示,整节课如沐春风:兰老师以由简入深、由表及里的思路,层层剖析配体与金属离子在水溶液中的行为——从亲水疏水性到阴阳离子相互作用力,逐步厘清逻辑、构建模型;课程尾声,兰老师引导学生运用模型解题并自主设计题目。整节课行云流水,令人意犹未尽。

2

专家点评

       申燕老师表示,每次聆听兰老师的课都能收获满满、深受启发,今天这堂课更是让人听得舍不得结束。申老师还采访了上课的学生,学生给出的评价是“深刻”。高三复习课能让学生发出“深刻”的感叹,这正是大师级教学功力的体现——兰老师从基础的萃取平衡切入,逐步延伸到不同类别物质的归纳总结,让学生听得明白、理解到位、应用轻松。这样的课堂值得每一位教育工作者深思与学习。

      广州大学关宏宇教授风趣地以“自比高一学生”作喻,高度评价兰老师课堂深入浅出的教学艺术:“如果我这位大学教授都能听懂,那说明这节课所有学生都能真正学懂。”他同时指出,本节课通过萃取流程的模型建构,有效培养了学生的工业流程思维与知识迁移能力,是一堂兼具素养导向与备考价值的优质示范课。

       广东省化学教研员程俊老师表示,高三复习是核心素养教学的关键攻坚战,复习课作为距离高考最近的课程,其重要性不言而喻,同时也是指引新授课方向的核心课程。高三复习课需达成三个层面的目标:知识的获取、知识的掌握与知识的驾驭。程老师提到,兰老师的这节示范课从一道题的理解切入,通过分析辨识与抽象概括的过程,逐步构建解题模型,借助知识的变式与迁移实现会解一类题的突破,最终达到“看见一片原野”的教学境界。兰老师践行了优秀教师的两大核心素养:一方面,凭借扎实的专业知识积累实现“让自己明白”;另一方面,通过化难为易的教学艺术达成“让学生明白”。

结语

        兰老师的示范课给现场的老师们很多思考,二轮复习中如何能利用有效的时间进行高效的复习。兰老师从教40年,功力之深让我们后辈叹服和敬佩,把一个工业流程中的常见的萃取和反萃取课题深挖和拓展,让学生能“知其然,知其所以然”。通过建模更让学生能得心应手的应用知识解决各种不同类型的萃取反萃取问题。高三(5)班的同学们上完课后也纷纷表示收获大,对于萃取反萃取的原理理解的通透了,他们对兰老师的课程的表示真是“深刻”。

        一节好的课堂能引起大家的思考,更能启发学生和老师们,犹如催化剂催化学生和老师们发生改变!

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  1. CONNECT:[ UseTime:0.000597s ] mysql:host=127.0.0.1;port=3306;dbname=c460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000685s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000288s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000264s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000499s ]
  8. SELECT * FROM `article` WHERE `id` = 532339 LIMIT 1 [ RunTime:0.000425s ]
  9. UPDATE `article` SET `lasttime` = 1775398507 WHERE `id` = 532339 [ RunTime:0.004240s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000231s ]
  11. SELECT * FROM `article` WHERE `id` < 532339 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000436s ]
  12. SELECT * FROM `article` WHERE `id` > 532339 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000351s ]
  13. SELECT * FROM `article` WHERE `id` < 532339 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001035s ]
  14. SELECT * FROM `article` WHERE `id` < 532339 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002357s ]
  15. SELECT * FROM `article` WHERE `id` < 532339 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002299s ]
0.080020s