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30/09/2021 6:18 pm
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(a) Name an alloy of copper. State its chemical composition and anyone use.
(b) Explain why, when a copper object remains in damp air for a considerable time, a green coating is formed on its surface. What is this process known as?
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30/09/2021 6:19 pm
(a) Brass: It contains Copper (Cu)-80% and Zinc(Zn) - 20%. It is used for making cooking utensils.
(b) When a copper object remains in damp air for a considerable time, then copper reacts slowly with the carbon dioxide and water of air to form a green coating of basic copper carbonate on the surface of the object. The formation of this green coating of basic copper carbonate corrodes it. This process is known as corrosion of copper.