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When pennies are put in vinegar and salt for 10 minutes is

When pennies are put in vinegar and salt for 10 minutes. Is the copper metal becoming copper II ion an oxidation or a reduction and why?

When the pennies coated with copper II ion were removed and exposed to the air, the copper II ion combined with oxygen gas to produce a blue product.What is the blue product and write its formula. Also, write the reaction showing copper II (aq) + oxygen gas --> blue product.

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Chemistry: When pennies are put in vinegar and salt for 10 minutes is

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