当前位置:首页>课件>【中考化学复习课件】拯救珊瑚礁——“二氧化碳” 为核心的碳循环

【中考化学复习课件】拯救珊瑚礁——“二氧化碳” 为核心的碳循环

  • 2026-04-06 21:03:46
【中考化学复习课件】拯救珊瑚礁——“二氧化碳” 为核心的碳循环
  1. (一)情景引入:初识珊瑚礁危机,激发探究兴趣(分钟)

    (二)寻因:探究珊瑚礁消失的根源,梳理 CO释放途径(10 分钟)

    教师展示《消失的珊瑚礁》资料(来自《Nature》杂志):正常情况下珊瑚礁的色彩来自珊瑚虫体内的虫黄藻,虫黄藻通过光合作用为珊瑚提供能量,若气候变暖持续,2070 年全世界珊瑚礁可能全部消失。

    提出问题串:

    ① 结合资料和生活知识,导致珊瑚礁消失的罪魁祸首是什么?

    ② 从海水酸化的角度,写出珊瑚礁消失的化学反应原理。

    学生小组讨论后回答:二氧化碳过量排放导致温室效应,海水温度升高、酸化,虫黄藻减少,珊瑚退化;化学反应为 CO + HO = HCO

    教师追问:除了海水酸化,二氧化碳过量排放还会对环境造成哪些负面影响?

    学生结合已有知识回答:温室效应、冰川融化、海平面上升、全球气候异常等。

    教师提出任务:二氧化碳的过量排放是根源,那生活和自然界中,哪些途径会释放二氧化碳?请写出相关的化学方程式。

    学生自主梳理并书写,小组代表分享,教师补充总结:

    (三)行动:探究 CO的吸收方法,提升实验探究能力(15 分钟)

    本环节围绕 “如何吸收二氧化碳,缓解海水酸化和温室效应” 展开,分为 “定量测定 CO在水中的溶解度”“对比不同试剂吸收 CO的效果”“了解工业吸收 CO的方法” 三个层次,层层递进。

    1)回顾基础:教师提问:水是自然界调节二氧化碳的重要物质,二氧化碳在水中的溶解度是多少?” 学生回答:体积比 1∶1

    2)实验设计:教师展示课前做好的 “二氧化碳溶于水使塑料瓶变瘪” 的演示实验,提出问题:如何设计实验定量测量二氧化碳的溶解度?” 提供实验器材,学生小组讨论,设计实验方案,教师展示并点评学生提出的 3 种方案。

    表格

    • 燃烧类:甲烷燃烧 CH + 2O点燃 CO + 2HO、木炭燃烧 C + O点燃 CO
    • 反应类:碳酸钙与稀盐酸反应 CaCO + 2HCl =      CaCl + HO + CO
    • 生命活动类:动植物呼吸作用、微生物氧化分解有机物。
    1. 定量测定 CO在水中的溶解度
    1. 设计意图:通过资料分析培养学生获取信息的能力,借助问题串引导学生将珊瑚礁消失与二氧化碳建立联系,梳理二氧化碳的释放途径并书写化学方程式,巩固基础知识,同时让学生意识到二氧化碳过量排放的危害,为后续探究 “吸收二氧化碳” 做好逻辑铺垫。
    1. 梳理归纳,书写 CO释放的化学方程式
    1. 拓展思考,分析 CO的环境危害
    1. 资料分析,定位罪魁祸首
    1. 视觉冲击:教师展示澳大利亚大堡礁正常珊瑚礁(五彩斑斓)和白化珊瑚礁(苍白枯萎)的对比图片,提问:同学们,同样是珊瑚礁,为什么会有如此大的差异?珊瑚礁正在慢慢消失,这背后的原因是什么?我们能做些什么来拯救它们?
    2. 任务驱动:明确本节课的核心任务 ——  “拯救珊瑚礁” 为主线,探究珊瑚礁消失的原因,并利用化学知识寻找保护珊瑚礁的方法,引出本节课的核心研究对象:二氧化碳。
    3. 设计意图:以真实的生态问题为切入点,激发学生的学习兴趣和探究欲望,让学生感受到化学知识与社会生活、生态环境的紧密联系,为后续知识探究做好铺垫。
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  1. CONNECT:[ UseTime:0.000709s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001018s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000349s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000547s ]
  6. SELECT * FROM `set` [ RunTime:0.000187s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000601s ]
  8. SELECT * FROM `article` WHERE `id` = 488249 LIMIT 1 [ RunTime:0.000456s ]
  9. UPDATE `article` SET `lasttime` = 1775707192 WHERE `id` = 488249 [ RunTime:0.021381s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007225s ]
  11. SELECT * FROM `article` WHERE `id` < 488249 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004837s ]
  12. SELECT * FROM `article` WHERE `id` > 488249 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002968s ]
  13. SELECT * FROM `article` WHERE `id` < 488249 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000745s ]
  14. SELECT * FROM `article` WHERE `id` < 488249 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000750s ]
  15. SELECT * FROM `article` WHERE `id` < 488249 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000793s ]
0.112373s