Answer:
reactivity-In chemistry, reactivity is the impetus for which a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy.
Tarnishing- is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air.
endothermic -(of a reaction or process) accompanied by or requiring the absorption of heat.
(of a compound) requiring a net input of heat for its formation from its constituent elements.
Rusting-deteriorate through neglect or lack of use.
exothermic-of a reaction or process) accompanied by the release of heat.
(of a compound) formed from its constituent elements with a net release of heat.
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