What is oxidation corrosion?

When a metal such as zinc or copper is exposed to the air (oxygen) it starts to corrode.

OXIDATION: Oxidation is any chemical reaction that is the combination of a metal with a gas. The oxidation is a transfer of electrons from the metal to the gas. When iron oxidizes with oxygen it is called rust.

Oxidation is the opposite of reduction. A reduction always comes together with an oxidation. Oxidation and reduction together are called redox.

Oxidation describes the loss of electrons or an increase in oxidation state by a molecule, atom or ion. COVALENT BOND: A covalent bond is a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms, or between atoms and other covalent bonds. In short, attraction-to-repulsion stability that forms between atoms when they share electrons is known as covalent bonding.

Covalent bonding includes many kinds of interaction, including σ-bonding, π-bonding, metal to non-metal bonding, agostic interactions, and three-center two-electron bonds. The term covalent bond dates from 1939. The prefix co- means jointly, associated in action, partnered to a lesser degree, etc.; thus a "co-valent bond", essentially, means that the atoms share "valence", such as is discussed in valence bond theory.

In the molecule H2, the hydrogen atoms share the two electrons via covalent bonding. Covalency is greatest between atoms of similar electronegativities. Thus, covalent bonding does not necessarily require the two atoms be of the same elements, only that they be of comparable electronegativity.

Although covalent bonding entails sharing of electrons, it is not necessarily delocalized. Furthermore, in contrast to electrostatic interactions ("ionic bonds") the strength of covalent bond depends on the angular relation between atoms in polyatomic molecules.

It is the reaction between oxygen molicules on different surfaces such as oxidation on metal turns it to rust, on fruits and vegetable oxidation turn them brown. I can only answer your first part I don;t know the rest. Sorry.

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