Anew statue of the town founder is erected in the park. at the unveiling, the statue is a orange-brown copper. after a year, the statue looks blue-green. has a physical or chemical change taken place?

if you're asking what comes out, it's steam.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.