Many metals react with oxygen to form metal oxides. Potassium and sodium are soft metal which are easily cut exposing a shiny surface which changes to dull rapidly. The change from shiny to dull ...

When metals react with oxygen, metal oxides are formed. The speed of the reaction depends on the reactivity of the metal. Watch this video for a practical demonstration of reacting metals with oyxgen.

Iron oxide, aluminum, and a catalyst are placed in a flowerpot ... When the solvent evaporates, the phosphorous combines with oxygen in an exothermic reaction. The demonstration shown in this video is ...

The color changes on the aluminum are normal, and occur due to the aluminum's reaction to oxygen. The oxygen and aluminum combine to form a layer of aluminum oxide on the surface of the foil ...