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A chemical change is always irreversible; that's part of the definition of "chemical change". This is because a new substances with new properties are formed. In this example, hydrogen and oxygen gas.

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12y ago
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12y ago

Because oxygen and hydrogen molecules combine to make h2o meaning water and it cannot be seperated again.THATS THE FINAL ANSWER.

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13y ago

No, the process can be reversed by electrolysis,.

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Q: Justify why electrolysis of water is a chemical irreversible change?
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