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 negative 183 degrees celcius and the other has a boiling point of negative 253 degrees celcius. Has a physical or chemical change occurred? Explain.

Answer 1

Answer is: chemical change occurred.
Electrolysis reaction: 2H₂O → O₂ + 2H₂.
In thic electrolysis reaction two gases are formed, one is oxygen with boiling point of -183°C and second one is hydrogen with boiling point of -253°C. This is chemical change because from one molecule two molecules are produced and because they have new boiling points, boiling point of water is 100°C.