The copper wire glows red. Once it cools...the copper reacts with the air to produce copper(II) oxide. This is shown by the black tarnish on the copper wire.
The resistance will go up.
It remains as metallic copper.
Copper.
copper gains heat
no
Copper sulfate is formed.
Copper vessels are easily corroded.
The resistance will go up.
the copper oxide will turn red
Copper(II) hydroxide and sodium nitrate are thermally decomposed to oxides by heating.
when copper and zinc are heated, they create brass :)