Question

what happened when we hear copper in presence of air​

Answer 1

Answer:

Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water. When the funnel is removed from the hydrogen stream, the copper was still be warm enough to be oxidized by the air again.

Answer 2

Did you mean "heat copper"??

but here is your answer

Explanations (including important chemical equations):

Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water.

PLZ mark me as the brainliest