当前位置:首页>面试真题>初中化学教资面试面试试讲真题逐字稿《如何从大豆中提取油脂》

初中化学教资面试面试试讲真题逐字稿《如何从大豆中提取油脂》

  • 2026-05-14 14:13:57
初中化学教资面试面试试讲真题逐字稿《如何从大豆中提取油脂》

如何从大豆中提取油脂》试讲逐字稿

面试真题解析

各位评委老师:

大家好!我是初中化学组的01号考生,今天我试讲的题目是《如何从大豆中提取油脂》。下面开始我的试讲。

一、导入新课

师: 同学们,请看多媒体展示的植物油图片,你们知道它们的主要成分是什么吗?

师: 对,是油脂。

师: 日常生活中,我们炒菜时常用到植物油,你们知道这些植物油是怎么来的吗?

师: 这节课,我们一起来探究大豆油的提取过程。

二、新课教学

师: 在正式开始之前,请同学们根据生活经验和所学知识,回忆一下油脂有哪些性质?请中间的这位同学回答。

师: 这位同学说,油脂不溶于水,易溶于有机溶剂。回答得非常好!请坐!

师: 油脂易溶于有机溶剂,我们可以利用这一特性,从大豆、花生等植物果实中提取油脂。今天我们将使用己烷作为提取剂。

师: 请看讲台,这是实验用具:大豆、己烷、研钵、过滤装置、烧杯和试管。接下来,请仔细观察我的实验操作。

师: 我先将5克大豆在研钵中研碎,然后转移到试管中,加入10毫升己烷,摇匀后静置几分钟。

师: 现在,油脂已经溶解在己烷中。接下来该怎么做呢?谁能告诉我?

师: 同学们回答得很好!我们要通过过滤进行固液分离,得到提取液。

师: 过滤后,我们得到了己烷和油脂的混合液。如何进一步分离出油脂呢?请后排的同学回答。

师: 这位同学说,可以利用沸点差异,通过蒸发分离己烷。太棒了!请坐!

师: 现在,我通过热水浴蒸发掉己烷,提取出了油脂。同学们,这个实验有趣吗?想自己试试吗?那就动手操作吧!

师: 实验完成后,同学们观察到大豆油是什么样的?

师: 对,是黄色油状液体。

三、拓展提高

师: 同学们,通过实验我们学会了提取大豆油脂。接下来,请观看一段短片,进一步了解富含油脂的食物。短片中的肥牛和花生都含有丰富的油脂。

师: 油脂在人体内的主要作用是储存和提供能量,其能量密度比糖类和蛋白质高约一倍,因此在生命活动中非常重要。生活中,我们要合理饮食,保持营养均衡。

四、小结作业

师: 通过我的演示和同学们的操作,大家对提取油脂的过程应该很熟悉了。谁愿意总结一下大豆油脂的提取步骤?请前排的同学回答。

师: 你说,提取大豆油脂的步骤是:研碎大豆 → 加入己烷 → 静置 → 过滤 → 蒸发己烷 → 加水震荡 → 静置。总结得太好了!请坐!

师: 同学们,今天的课到此结束,下课!

五、板书设计

如何从大豆中提取油脂

超优惠面试资料,添加老师微信!

微信扫描添加老师好友呢

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  134. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-view/src/Think.php ( 8.38 KB )
  135. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
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  137. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/no.15386.cn/runtime/temp/97c957f747c268aee476c4e16775dd7c.php ( 12.06 KB )
  140. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000519s ] mysql:host=127.0.0.1;port=3306;dbname=no_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000715s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000285s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000518s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000578s ]
  8. SELECT * FROM `article` WHERE `id` = 466728 LIMIT 1 [ RunTime:0.001133s ]
  9. UPDATE `article` SET `lasttime` = 1778744356 WHERE `id` = 466728 [ RunTime:0.005015s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000316s ]
  11. SELECT * FROM `article` WHERE `id` < 466728 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000605s ]
  12. SELECT * FROM `article` WHERE `id` > 466728 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000428s ]
  13. SELECT * FROM `article` WHERE `id` < 466728 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005921s ]
  14. SELECT * FROM `article` WHERE `id` < 466728 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004578s ]
  15. SELECT * FROM `article` WHERE `id` < 466728 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005396s ]
0.098925s