当前位置:首页>学习笔记>【26版化学步步高人教版学习笔记必修第一册第一章第三节第4课时氧化还原反应方程式的配平

【26版化学步步高人教版学习笔记必修第一册第一章第三节第4课时氧化还原反应方程式的配平

  • 2026-03-06 02:48:53
【26版化学步步高人教版学习笔记必修第一册第一章第三节第4课时氧化还原反应方程式的配平

[核心素养发展目标] 1.掌握氧化还原反应方程式配平的依据,学会配平氧化还原反应方程式的一般步骤。2.掌握配平氧化还原反应方程式的常用技巧。

一、正向配平氧化还原反应方程式的依据及步骤

1.氧化还原反应方程式配平的依据

(1)得失电子守恒:氧化剂和还原剂得失电子总数相等,化合价__________=化合价__________。

(2)质量守恒:反应前后元素的__________和原子的__________不变。

(3)电荷守恒(离子方程式):反应前后电荷总数不变。

2.氧化还原反应方程式配平的一般步骤

以H2O2+H2CrO4——O2+Cr(OH)3+H2O为例

(1)标价态:标出发生氧化反应和还原反应的元素的化合价。

H2+H2O4——+(OH)3+H2O

(2)列变化:标出反应前后元素化合价的变化,分析1分子氧化剂还原产物化合价降低数值,1分子还原剂氧化产物化合价升高数值。

(3)求总数:配出氧化剂、还原剂及氧化产物和还原产物的化学计量数。

计算化合价升高总数与降低总数的最小公倍数为6,使化合价升高和降低的总数相等,即得失电子守恒。×后面的数字就是反应物或生成物的化学计量数。

(4)根据原子守恒配平其他物质的化学计量数。

3H2O2+2H2CrO4——3O2+2Cr(OH)3+2H2O

(5)查守恒:原子个数是否守恒,配平后,把单线改成长等号,标注反应条件。

3H2O2+2H2CrO42+2Cr(OH)3+2H2O

1.配平下列化学方程式。

(1)__________Mg+__________CO2

(2)__________Na2SO3+__________KIO3+__________H2SO42SO4+__________K2SO4+__________I2+__________H2

2.运动会上发令枪所用火药的主要成分是氯酸钾和红磷,撞击时发生的化学反应为KClO3+PP2O5+KCl(未配平)。下列有关该反应的叙述正确的是(  )

A.氯酸钾被氧化

B.反应中每生成1个P2O5时,转移5个电子

C.单质P被还原,发生还原反应

D.配平后反应的化学方程式为5KClO3+6P3P2O5+5KCl

二、配平氧化还原反应方程式的常用技巧

题型1 逆向配平法

分解反应、歧化反应、部分氧化还原反应,一般使用逆向配平的方法,即先从氧化产物和还原产物开始配平。

1 __________S+__________KOH__________K2S+__________K2SO3+__________H2

分析

硫单质既是氧化剂又是还原剂,K2S是__________产物,K2SO3是__________产物。

(1)化合价的变化,生成1个K2S化合价__________价,生成1个K2SO3化合价__________价,化合价变化的最小公倍数为__________,因而K2S化学计量数为__________,K2SO3的化学计量数为__________。

(2)根据S原子守恒确定单质硫的化学计量数为__________。

(3)再根据K原子守恒配出KOH的化学计量数为__________。

(4)最后定H2O的化学计量数为__________。

1.一定条件下,硝酸铵受热分解的化学方程式(未配平)为NH4NO33+N2+H2O,下列说法错误的是(  )

A.配平后H2O的系数为6

B.NH4NO3既是氧化剂又是还原剂

C.该反应既是分解反应也是氧化还原反应

D.氧化产物和还原产物的质量之比为53

题型2 离子方程式的配平

首先根据得失电子守恒和原子守恒配平氧化剂、还原剂和氧化产物、还原产物,根据电荷守恒,配平离子方程式两边电荷数,最后根据原子守恒配平未变价元素的原子。

2 __________Mn+__________H++__________H2O22++__________O2+__________H2

分析

先根据得失电子守恒确定氧化剂Mn、还原剂H2O2、还原产物Mn2+、氧化产物O2的化学计量数分别是__________、__________、__________、__________;根据电荷守恒确定H+的化学计量数为__________,根据H原子守恒确定H2O的化学计量数为__________,最后用O原子守恒检验。

2.(2023·湖北孝感一中高一期中)已知在碱性条件下,发生反应:Fe3++ClO-+OH-+Cl-+H2O(未配平)。

(1)Fe中铁元素化合价为__________。 

(2)Fe是__________(填氧化还原)产物。 

(3)配平该离子方程式:__________。 

题型3 缺项配平类[一般缺的为酸(H+)、碱(OH-)、水]

(1)先将得失电子数配平,再观察两边电荷。若反应物这边缺正电荷,一般加H+,生成物一般加水;若反应物这边缺负电荷,一般加OH-,生成物一般加水,然后根据两边电荷数进行配平。

(2)当化学方程式中有多个缺项时,应根据化合价的变化找准氧化剂、还原剂、氧化产物、还原产物。

3 __________Mn+__________I-+____________________Mn2++__________I2+__________H2

3.已知离子方程式:As2S3+H2O+N+S+NO+__________(未配平),下列说法错误的是(  ) 

A.配平后H2O的化学计量数为4

B.反应后溶液呈酸性

C.配平后氧化剂与还原剂的化学计量数之比为328

D.氧化产物为As和S

通过网盘分享的文件:【学生用书Word版文档】 整本等5个文件

链接: https://pan.baidu.com/s/15FiK8RTPyvbiSWACNxFztg?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000496s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000655s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001532s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 472351 LIMIT 1 [ RunTime:0.003775s ]
  9. UPDATE `article` SET `lasttime` = 1772776935 WHERE `id` = 472351 [ RunTime:0.000667s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000221s ]
  11. SELECT * FROM `article` WHERE `id` < 472351 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002825s ]
  12. SELECT * FROM `article` WHERE `id` > 472351 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000848s ]
  13. SELECT * FROM `article` WHERE `id` < 472351 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001351s ]
  14. SELECT * FROM `article` WHERE `id` < 472351 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005114s ]
  15. SELECT * FROM `article` WHERE `id` < 472351 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002172s ]
0.089368s