当前位置:首页>学习笔记>【2026版化学苏教版必修第一册学习笔记培优讲义专题1第三单元第1课时分散系、胶体

【2026版化学苏教版必修第一册学习笔记培优讲义专题1第三单元第1课时分散系、胶体

  • 2026-03-25 14:32:19
【2026版化学苏教版必修第一册学习笔记培优讲义专题1第三单元第1课时分散系、胶体

第1课时 分散系、胶体

[核心素养发展目标]1.能根据分散质粒子直径的大小对分散系分类,知道胶体是一种重要的分散系。2.了解丁达尔效应,并能区分溶液和胶体。3.了解胶体在生产和生活中的应用。

一、常见的分散系

1.分散系的含义与组成

思考1完成下表,写出常见分散系的分散质和分散剂。

分散系

分散质

分散剂

食盐水

有色玻璃

2.分散系的分类

(1)按照分散质粒子直径的大小分类:

(2)实例

思考2某混合液中含泥沙、淀粉、氯化钠三种成分,如何除去泥沙?

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1.正误判断

(1)胶体、溶液和浊液都为混合物(  )

(2)分散系中的分散剂一定为液体(  )

(3)分散系中的分散质一定为纯净物(  )

(4)蔗糖水、泥浆、淀粉溶液都属于胶体(  )

(5)溶液、胶体、浊液的本质区别是分散质粒子直径的大小(  )

2.下列关于分散系的说法不正确的是(  )

A.所有的分散系都是混合物

B.浊液中分散质颗粒不能透过滤纸

C.碘酒这种分散系的溶质是酒精

D.雾是小水滴的聚集体分散到空气中形成的分散系

3.(2023·连云港高一期中)2023年诺贝尔化学奖授予给发现和开发量子点方面做出贡献的科学家,量子点是一种直径为1~100 nm的半导体。下列分散系中,分散质粒子的直径和量子点的直径具有相同数量级的是(  )

A.溶液B.胶体

C.悬浊液D.乳浊液

4.溶液、胶体和浊液三种分散系的本质区别是(  )

A.是否是大量分子或离子的集合体

B.是否能通过滤纸

C.分散质粒子直径的大小

D.是否均一、透明、稳定

二、胶体

1.胶体的性质

胶体是一种较为特殊,应用广泛的分散系。胶体分散质粒子的直径介于之间,因而胶体表现出一些特殊的性质。 

(1)丁达尔效应

实验探究

操作

从垂直于光线的方向观察现象

原因分析

胶粒的直径为m,能对光线

无明显现象

溶液中粒子的直径m,散射极其微弱 

丁达尔效应:当光束通过胶体时,在光线的方向可以看到一条。实验室中可用丁达尔效应区分。 

(2)吸附性

实验探究

操作

现象

结论

溶液变

Fe(OH)3胶体的胶粒具有,能够吸附水中的悬浮颗粒物并沉降,可用于

依然

CuSO4溶液没有的作用 

特别提醒胶体的本质特征是分散质粒子的直径在1~100nm之间,胶体可以透过滤纸但不能透过半透膜。胶体的显著物理特征是丁达尔效应。

2.胶体的应用

(1)作净水剂。铁盐(如FeCl3)和铝盐(如明矾[KAl(SO4)2·12H2O])溶于水后能形成Fe(OH)3胶体和Al(OH)3胶体,常用作净水剂,但不能杀菌消毒。

(2)改善材料的机械性能和光学性质。

(3)医学上利用高度分散的胶体来检验或治疗疾病。

(4)广泛用于冶金工业中的选矿,石油原油的脱水,塑料、橡胶及合成纤维等的制造。

思考

1.能否根据分散系是否均一、透明区分胶体和其他分散系?

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通过网盘分享的文件:word讲义

链接: https://pan.baidu.com/s/1PNDK7_UY-I6aOdOvfo5O5Q?pwd=4321 提取码: 4321 

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  128. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-helper/src/Collection.php ( 16.47 KB )
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  1. CONNECT:[ UseTime:0.000493s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000918s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000342s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 474662 LIMIT 1 [ RunTime:0.000416s ]
  9. UPDATE `article` SET `lasttime` = 1774535918 WHERE `id` = 474662 [ RunTime:0.011484s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 474662 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000394s ]
  12. SELECT * FROM `article` WHERE `id` > 474662 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000375s ]
  13. SELECT * FROM `article` WHERE `id` < 474662 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000958s ]
  14. SELECT * FROM `article` WHERE `id` < 474662 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000994s ]
  15. SELECT * FROM `article` WHERE `id` < 474662 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003296s ]
0.089508s