Question

A metal substance reacts with oxygen, changing its color.

What type of reaction is this?

Responses

combustion
combustion

phase change
phase change

baking
baking

tarnishing
tarnishing

Answer 1

The type of reaction you are describing, where a metal reacts with oxygen and changes its color, is most likely **tarnishing**. Tarnishing typically involves a metal reacting with sulfur compounds or oxygen, resulting in a color change due to the formation of a layer of corrosion on the surface of the metal.

Combustion usually refers to a rapid reaction with oxygen that produces heat and light, phase change involves changes in the physical state of a substance (e.g., solid to liquid), and baking is a cooking process rather than a chemical reaction.

So, the correct response is **tarnishing**.