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(i) chemical change
(ii)chemical change
(iii)physical change
Explanation:
(i) Chemical change: When hydrogen comes upon contact with fire, it is
oxidized hence it is a chemical reaction.
(ii)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.
(iii)If the cause was abrasion, it is a
physical change.
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