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化学初高中教材衔接——氧化剂、还原剂

  • 2026-08-07 06:58:19
化学初高中教材衔接——氧化剂、还原剂
一、初中阶段要求

1. 从得氧失氧角度识别氧化剂、还原剂;

2. 掌握金属活动性顺序。

二、高中阶段要求

1. 从电子转移本质定义氧化剂、还原剂及相关产物概念;

2. 识记常见的氧化剂与还原剂;

3. 掌握氧化性、还原性强弱的比较方法;

4. 理解电子守恒规律,用于配平与计算。

三、衔接要点

1. 认知升级:从表观得氧失氧深入到电子转移本质;

2. 能力进阶:掌握强弱比较与守恒计算的核心方法;

3. 体系构建:建立完整的氧化还原概念逻辑体系。

四、初中知识回顾

1.氧化剂:提供氧的物质。

还原剂:夺去氧的物质。

2.金属活动性(还原性):

K>Ca>Na>Mg>Al>Zn>Fe>Sn>Pb>(H)>Cu>Hg>Ag>Pt>Au

五、高中知识衔接
01
氧化剂、还原剂及相关概念

氧化剂:氧化还原反应中得到电子(或电子对偏向)的物质,在反应时所含元素的化合价降低。

还原剂:氧化还原反应中失去电子(或电子对偏离)的物质,在反应时所含元素的化合价升高。

氧化产物:还原剂发生氧化反应后的生成物,即化合价升高的元素的产物。

还原产物:氧化剂发生还原反应后的生成物,即化合价降低的元素的产物。

举例:

02
常见的氧化剂和还原剂

(1)常见的氧化剂:

①活泼的非金属单质:如Cl₂、O₂、Br₂、F₂等。

②高价金属阳离子:如Fe³⁺、Sn⁴⁺、Cu²⁺等。

③高价或较高价含氧化合物:如KMnO₄、MnO₂、PbO₂、KClO₃等。

④过氧化物:如H₂O₂、Na₂O₂等。

(2)常见的还原剂

①金属单质:如K、Na、Mg等。

②某些非金属单质:如H₂、C、Si等。

③低价态金属阳离子:如Fe²⁺、Cu⁺等。

④元素处于低价态的氧化物:如CO、NO、SO₂等。

⑤非金属阴离子及低价态化合物:如S²⁻、I⁻、H₂S等。

⑥非金属氢化物:如HBr、HI、H₂S等。

03
氧化性、还原性强弱的比较

(1)根据氧化还原反应方程式判断

氧化性:氧化剂(反应物)>氧化产物(产物)

还原性:还原剂(反应物)>还原产物(产物)

(2)根据金属活动性顺序判断

(3)根据非金属活动性顺序判断

非金属单质得电子能力逐渐减弱,氧化性逐渐增强。

非金属单质对应阴离子失电子能力逐渐增强,还原性逐渐增强。

(4)根据同种元素的价态高低判断

一般来说,对于同种元素来说,价态越高,其氧化性越强;价态越低,其还原性越强。

如:

但氧化性: HClO>HClO₂>HClO₃>HClO₄

04
氧化还原反应守恒规律及应用

还原剂失电子总数=氧化剂得电子总数=氧化剂化合价降低总数=还原剂化合价升高总数=转移电子总数

应用:氧化还原反应方程式的配平和相关计算。

05
氧化还原反应概念间的关系

即:氧化剂→得到电子→所含元素化合价降低→被还原→发生还原反应→得到还原产物;

还原剂→失去电子→所含元素化合价升高→被氧化→发生氧化反应→得到氧化产物。

记忆口诀:“升失氧作还原剂、降得还作氧化剂”。 

六、习题衔接

1.下列物质之间的转化,需要加入还原剂才能实现的是(  )

2.已知强弱顺序:还原性:I⁻>Fe²⁺>Br⁻>Cl⁻,氧化性:Cl₂>Br₂>Fe³⁺>I₂,下列反应的化学方程式或叙述不成立的是(  )

A.Br₂+2HI=I₂+2HBr 

B.2FeCl₂+Cl₂=2FeCl₃

C.2FeCl₂+2HCl+I₂=2FeCl₃+2HI

D.Cl₂通入NaBr和NaI的混合溶液中:I⁻先被氧化

3.宋代著名法医学家宋慈的《洗冤集录》中有关于银针验毒的记载,其原理是4Ag+2H₂S+O₂=2X+2H₂O,下列说法不正确的是(  )

A.X为Ag₂S

B.银针验毒时,空气中的氧气得到电子

C.该反应中Ag和H₂S均是还原剂

D.该反应每生成1个X,转移2个电子

答案:1.C  2.C  3.C

END

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  1. CONNECT:[ UseTime:0.000469s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000821s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000350s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000319s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000532s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000613s ]
  8. SELECT * FROM `article` WHERE `id` = 470093 LIMIT 1 [ RunTime:0.001800s ]
  9. UPDATE `article` SET `lasttime` = 1786093550 WHERE `id` = 470093 [ RunTime:0.001929s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000247s ]
  11. SELECT * FROM `article` WHERE `id` < 470093 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `article` WHERE `id` > 470093 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000424s ]
  13. SELECT * FROM `article` WHERE `id` < 470093 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001541s ]
  14. SELECT * FROM `article` WHERE `id` < 470093 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001011s ]
  15. SELECT * FROM `article` WHERE `id` < 470093 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001466s ]
0.078939s