why does a copper vessel develop a greenish layer when exposed to moist air?
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Copper turns green because of chemical reactions with the elements. Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.
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When a copper vessels is exposed to moist air for long , it acquires a dull green coating . The green material is a mixture of copper hydroxide [Cu(OH2) and copper carbonate [CuCo3] . The following is the reaction 2 Cu + H 2 O+ CO 2 + O 2 -> Cu (OH) 2 + CuCO 3 .
Explanation:
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