Final answer:
A transformation can be classified as reduction, oxidation, or neither based on the gain or loss of electrons, hydrogen, or oxygen. Reduction involves gaining electrons or gaining hydrogen/losing oxygen, while oxidation involves losing electrons or losing hydrogen/gaining oxygen. If a transformation doesn't involve these changes, it is neither reduction nor oxidation.
Step-by-step explanation:
The classification of a transformation as a reduction, oxidation, or neither is determined by the gain or loss of electrons, hydrogen, or oxygen.
If a substance gains electrons, it is undergoing reduction. If a substance gains oxygen or loses hydrogen, it is also considered reduction. On the other hand, if a substance loses electrons, it is undergoing oxidation. If a substance loses oxygen or gains hydrogen, it is also considered oxidation. If a transformation does not involve the gain or loss of electrons, hydrogen, or oxygen, it is classified as neither reduction nor oxidation.