Water is produced by the oxidation of hydrogen. Hydrogen has reached its usual valence (+1), and oxygen has also reached its usual valence (-2), so the total valence is stable at 0. If it burns If a compound is formed with gaseous elements , the total valence will not be 0 (almost no gaseous element has a valency of 0 when combined) and no new compounds will be generated, which is inconsistent with the important conditions of combustion (must be a chemical reaction ). Water is therefore not flammable.
What is the principle of electrolysis of water to produce oxygen?
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The electrolysis of water is actually a redox reaction. Direct current has a positive electrode and a negative electrode. The positive electrode is positively charged, so it absorbs electrons, and the negative electrode is negatively charged, so it donates electrons. (because positive charges cannot move). Water The oxygen in the molecule is divalent negative, so it can donate electrons to the positive electrode. The hydrogen in the water molecule is monovaslow positive, so it can accept electrons.
Thus, the negative electrode gives electrons to hydrogen, transforming hydrogen into hydrogen gas, the positive electrode absorbs electrons from oxygen , causing oxygen to go from a negative valence of two to a valence of 0, and it becomes oxygen.