Question

When an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183 degrees celsius and the other has a boiling point of -253 degrees celsius. Has a physical change or a chemical change occurred? Explain.

Answer 1

Electrolysis of water is a CHEMICAL change, you are breaking apart molecules of
\[H_{2}O\] into elementary \[H_{2}\] and \[O_{2}\] Clearly this is a chemical reaction and a physical change does not evolve a chemical reaction.It is a chemical change