2007-09-24 06:19:13 · 6 answers · asked by veondra r 1 in Science & Mathematics ➔ Chemistry
It's a chemical reaction.
It's a reaction of Hydrogen sulfide with silver metal
H2S(g) + Ag(s) --> Ag2S(s) + H2(g)
ref: http://en.wikipedia.org/wiki/Hydrogen_sulfide
2007-09-24 06:23:49 · answer #1 · answered by Dr Dave P 7 · 2⤊ 0⤋
A color change indicates a chemical reaction. The black tarnish is a new compound of the silver and oxygen.
2007-09-24 06:35:51 · answer #2 · answered by science teacher 7 · 1⤊ 0⤋
It is chemical change only (oxidation) Ag react with Atmospheric O2 become AgO2 thin layaer (micron)
2007-09-24 06:27:43 · answer #3 · answered by ricky414 5 · 1⤊ 0⤋
It's chemical. The surface is "oxidizing" similar to rusting of iron.
2007-09-24 06:24:54 · answer #4 · answered by billgoats79 5 · 1⤊ 0⤋
It's chemical. If you polish it, the surface will return to the original "look".
2007-09-24 06:28:23 · answer #5 · answered by kathy s 6 · 1⤊ 0⤋
both
oxidation, which is a chemical reaction
and
it physically changes the metal
2007-09-24 06:28:51 · answer #6 · answered by ronald c 3 · 0⤊ 2⤋