一离子方程式的书写方法 1.书写步骤离子方程式应按照“一写、二拆、三删、四查”的步骤书写。2.书写要点方程式在书写时应抓住两易、三等、三查的要点。两易:即易溶、易电离的物质(包括强酸、强碱、大多数可溶性盐)拆写成离子形式;非电解质、难电离的物质(包括弱酸、弱碱、水等)、难溶物、单质、氧化物、气体等仍用化学式表示。三等:离子方程式两边的原子个数和电荷总数相等及得失电子数相等。三查:检查各项是否都有公约数,是否漏掉某些离子反 An ion equation writing method 1. Writing steps Ion equation should be in accordance with “a write, two split, three cut, four check ” steps to write. 2. Writing Points Formula in writing should seize the two easy, third, three check points. Two easy: that is, easy to dissolve, easily ionized substances (including strong acid, alkali, most soluble salts) into the form of ions; non-electrolyte, difficult to ionization of the material (including weak acid and alkali, water, etc.) Simple substance, oxide, gas, etc. are still expressed by chemical formula. Third: ion equation on both sides of the number of atoms and the total number of equal and loss of income equal to the number of electrons. Three checks: check whether all have the common divisor, whether to miss some of the anti-ion