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化学电池电极反应式的书写是高考的高频考点,由于化学电池的品种繁多,因此电极反应式变化多端,在书写时常会出现错误.书写的一般步骤和技巧是:1、分析电极反应.负极化合价升高,失电子,发生氧化反应,写出氧化产物的简单形式;正极化合价降低,得电子,发生还原反应,写出还原产物的简单形式.2、注意电解质环境.电极产物在电解质中要能稳定存在,写出产物的正确形式.3、根据电荷守恒,原子守恒配平电极反应式.4、根据正负极得失电子守恒,两电极反应式叠加得电池反应方程式.5、若已知电池总反应,也可以用电池总反应的离子方程式减去某一电极反应式求得另一电极反应式.
Electrochemical battery electrode reaction writing is the college entrance examination of high-frequency, due to the wide variety of chemical batteries, so the electrode reaction varies, writing errors often occur. Writing general steps and tips are: 1, analysis of the electrode reaction. The valence increased, the loss of electrons, the oxidation reaction occurs, write the simple form of oxidation products; positive valence valence, have electrons, the reduction reaction, write down the simple form of reduction products .2, pay attention to the electrolyte environment. Electrode products in the electrolyte to Can exist stably, write the correct form of the product .3, according to the conservation of charge, atomic conservation with balanced electrode reaction .4, according to the positive and negative gain and loss of electrons conservation, two electrode reaction superimposed battery reaction equation .5, if the battery is known The total reaction, you can also use the battery total reaction ion equation minus a certain electrode reaction equation to obtain the other electrode reaction equation.