Here's why:
* Oxidation refers to the loss of electrons by a molecule or atom.
* Adding oxygen often results in the molecule losing electrons, as oxygen is highly electronegative and tends to pull electrons towards itself.
* Removing hydrogen also typically involves the loss of electrons, as the hydrogen atom often leaves behind its electron in the process.
Important Note: While oxidation is often associated with oxygen, it's important to remember that it's defined by the loss of electrons, which can occur through various mechanisms, not just the addition of oxygen or removal of hydrogen.
