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Anonymous users2024-01-24(1) By the representation method of the ion, in the upper right corner of the element symbol representing the ion, mark the number of positive and negative charges carried by the ion, the number is in front, the positive and negative signs are in the back, with 1 charge, 1 should be omitted If more than one ion is expressed, the corresponding number is added in front of the ion symbol, so the 2 ammonium ions can be expressed as: 2NH4
(2) By the representation method of the ion, in the upper right corner of the element symbol representing the ion, mark the number of positive and negative charges carried by the ion, the number is in front, the positive and negative signs are in the back, and when there is 1 charge, 1 should be omitted If it represents more than one of the ions, the corresponding number is added in front of the ion symbol, so 2 aluminum ions can be expressed as: 2Al3+
3) Acetic acid is an acidic flavoring agent in the kitchen, and its chemical formula is: CH3COOH
4) The main component of magnetite is ferric tetroxide, and its chemical formula is: Fe3O4
5) The properties of ammonium ions are similar to metal ions, so ammonium ions can be regarded as metal ions The alkali formed by ammonium ions and hydroxide ions is ammonium hydroxide, that is, ammonia, which is the only base that does not contain metal ions Its chemical formula is NH3?H2O．
6) Representation method of element valency: determine the valency of the element to be marked in the compound, and then use the plus and minus signs and numbers above the chemical formula of the element, plus and minus signs in front, and numbers in the back, so the aluminum element in aluminum hydroxide shows +3 valence, so it can be expressed as: +3
Al（OH）3；
So the answer is: (1) 2NH4
（2）2Al3+（3）CH3COOH （4）Fe3O4 （5）NH3?H2O （6）+3
Al（OH）3
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