Which equation describes the half-reaction that occurs at the cathode during the electrolysis of water? 4h+(aq + 4oh–(aq ? 4h2o(l 2h2o(l ? 2h2(g + o2(g o2(g + 4h+(aq + 4e– ? 2h2o(l 2h2o(l + 2e– ? h2(g + 2oh–(aq?

Electrolysis of water involves the decomposition of water into oxygen and hydrogen gas by passing an electric current through water. The positively charged ion (hydrogen ion) moves to the negative electrode (cathode) during electrolysis, while the negatively charged ion (OH-) moves to the positive electrode (anode). Therefore, the half equation that occurs at the cathode during the electrolysis of water will be; 
4H+(aq) + 4e- = 2H2 (g)

The answer should be vaporization 

A. ​it generates energy from carbohydrates.b. it requires activation by oxygen.​c. ​it is used by cells to dispose of excess electrons