Potassium and sodium are soft metal ... close tarnishingThe reaction of a metal with oxygen with air in which the surface of the metal changes from shiny to dull.

Incredibly, the reaction between iron and moist air that produces rust is a very ... we tried for our hand warmer involved dissolving potassium carbonate (K 2 CO 3) in water.

In this reaction, the catalyst is potassium permanganate. The reaction produces a lot of heat so the substance shooting out of the bottle is water vapor that is condensing in the cooler air. Oxygen ...

The potassium reacts with the water and gets very hot, producing potassium hydroxide and hydrogen gas which ignites. The reaction of the potassium with water is similar to the reaction of sodium in ...