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4第二单元第2课时氧化还原反应方程式的配平

【2026版化学苏教版必修第一册学习笔记培优讲义专题4第二单元第2课时氧化还原反应方程式的配平

  • 2026-03-24 17:32:47
【2026版化学苏教版必修第一册学习笔记培优讲义专题4第二单元第2课时氧化还原反应方程式的配平

[核心素养发展目标]掌握氧化还原反应方程式的配平。

一、氧化还原反应方程式的配平

1.配平原则

(1)得失电子守恒:氧化剂和还原剂得失电子总数相等,化合价升高总数=化合价降低总数。

(2)质量守恒:反应前后原子的种类和个数不变。

(3)电荷守恒:离子反应前后,阴、阳离子所带电荷总数相等。

2.配平的一般步骤

以碳与浓硫酸反应生成二氧化碳、二氧化硫和水为例

(1)标变价:写出反应物、生成物的化学式,并在化学方程式中标出化合价发生变化的元素的化合价。

+H2O4(浓)——O2+O2+H2O

(2)列得失:根据化合价的变化标出电子转移的方向和数目。

(3)求总数:使得失电子的总数相等。

(4)配系数:根据质量守恒定律配平其他物质的化学计量数,并添加气体符号,注明反应条件,将单线改为双线。

C+2H2SO4(浓)CO2+2SO2+2H2O

(5)查守恒:利用守恒三原则,检查是否配平。

1.配平下列化学方程式。

(1)Mg+CO2C+MgO 

(2)Na2SO3+KIO3+H2SO4===Na2SO4+K2SO4+I2+H2

2.(2024·福建泉州高一段考)储氢纳米碳管的研究成功体现了科技的进步,但用电弧法合成的碳纳米管常伴有大量的杂质——碳纳米颗粒,这种碳纳米颗粒可用氧化气化法提纯,其反应化学方程式为

C+K2Cr2O7+H2SO4===CO2+K2SO4+Cr2+H2O。 

(1)配平上述化学方程式。

(2)若反应中电子转移了0.8 mol,则产生的气体在标准状况下的体积为 L。 

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+KOHK2S+K2SO3+H2

分析

硫单质既是氧化剂又是还原剂,K2S是产物,K2SO3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. (2024·河北衡水高一段考)以太阳能为热源分解Fe3O4,经热化学铁氧化合物循环分解水制H2,其过程如下:

过程:Fe3O42(未配平);

过程:FeO+H2OH2+Fe3O4(未配平)。下列说法错误的是(  )

A.过程的反应中还原产物是FeO

B.过程的反应中每生成12个FeO转移8个电子

C.该方法制H2具有成本低、产物易分离等优点

D.过程的反应中FeO和H2O的化学计量数之比为21

题型2 离子方程式的配平

首先根据得失电子守恒和质量守恒配平氧化剂、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++H2O2===Mn2++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(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.NaNO2是一种食品添加剂,能致癌。酸性高锰酸钾溶液与亚硝酸钠反应的离子方程式是Mn+N++N+H2O。下列叙述正确的是(  )

A.该反应中N被还原

B.反应过程中溶液的pH变小

C.生成1 mol NaNO3需要消耗0.4 mol KMnO4

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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  1. CONNECT:[ UseTime:0.000979s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001571s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000764s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000665s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001410s ]
  6. SELECT * FROM `set` [ RunTime:0.000627s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001471s ]
  8. SELECT * FROM `article` WHERE `id` = 474996 LIMIT 1 [ RunTime:0.001098s ]
  9. UPDATE `article` SET `lasttime` = 1774479407 WHERE `id` = 474996 [ RunTime:0.024908s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000744s ]
  11. SELECT * FROM `article` WHERE `id` < 474996 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001232s ]
  12. SELECT * FROM `article` WHERE `id` > 474996 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000936s ]
  13. SELECT * FROM `article` WHERE `id` < 474996 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001674s ]
  14. SELECT * FROM `article` WHERE `id` < 474996 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003331s ]
  15. SELECT * FROM `article` WHERE `id` < 474996 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001976s ]
0.131531s