Scooby Doo went out to look at his Doghouse but he discovered that the roof which was made of a sheet of copper metal had changed from its original shiny metallic “penny” bright color to a shade of deep green. The original copper metal had gradually been covered by a green patina which is usually a mixture of copper chlorides, copper carbonates and copper sulfides. Is the observation that this patina forms a chemical or a physical property?
e. not enough information given to make a determination
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