Question

What happens when copper reacts with moist carbon dioxide?

Answer 1

Copper firsts reacts with Oxygen to form Copper Oxide(CuO). Further this Copper Oxide reacts with Carbon dioxide to form Copper carbonate(CuCO3). ... Copper can also be corroded by acid rain. When Carbon dioxide reacts with rainwater it forms Carbonic acid(H2CO3) which reacts with Copper to form Copper carbonate.

Answer 2

When copper reacts with moist carbon dioxide it loses its shiny brown surface and gains a green coat. This green substance is copper carbonate.