Question

multiple-choice question
turning water into hydrogen gas and oxygen gas
chemical change
physical change
rewatch

Explanation:

A chemical change involves the formation of new substances. When water ($H_2O$) is turned into hydrogen gas ($H_2$) and oxygen gas ($O_2$), new substances are created (the chemical composition changes, as water is a compound of hydrogen and oxygen, and the process breaks the bonds in water molecules to form new gaseous molecules). A physical change does not create new substances, only changes in state or appearance. So this is a chemical change.

Answer:

Chemical change