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Sanjay Radadiya · Answer 1 · 2021-04-13T05:20:44+0000

Answer:

The formula is as follows

2Cu + O2 ---> 2CuO

When two copper atoms react with a diatonic oxygen, they form copper oxide (rust)

Moon Cheesez · Answer 2 · 2021-04-19T03:59:16+0000

The reason copper coins dull in the first place, is because copper reacts with oxygen in the air and form a layer of copper oxide which is a dull greenish-grey colour. When you mix the salt (sodium chloride) with the vinegar (acetic acid) you form Sodium acetate and Hydrogen chloride.

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