Combining copper and sulfur results in the formation of copper sulfide (CuS). This reaction is a chemical reaction where the copper and sulfur atoms bond together to form a new compound with different properties than the original elements.

Here's a breakdown:

* Reaction: Copper (Cu) + Sulfur (S) → Copper sulfide (CuS)

* Type of reaction: This is a synthesis reaction, where two or more substances combine to form a single, more complex substance.

* Appearance: Copper sulfide is a black solid with a metallic luster.

The reaction can be carried out by heating copper in the presence of sulfur. The heat provides the energy needed for the reaction to occur.

Note: The specific type of copper sulfide formed depends on the reaction conditions. For example, heating copper and sulfur in a closed container can result in the formation of Cu2S (copper(I) sulfide).

Copper sulfide has several applications, including:

* As a pigment in paints and inks.

* As a component of some types of batteries.

* As a catalyst in certain chemical reactions.

Let me know if you'd like more details about the reaction or the properties of copper sulfide!