For metals like aluminum and iron, which are found naturally in nature as oxides, the refining process requires that the metals be by gaining electrons to yield the final metallic product (1 point).

reduced

Explanation:

To win the metallic product from the oxide, it demands that the metal be reduced.

During reduction a metal will:

The specie that is reduced will become the oxidant and reducing agent in the chemical reaction.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)