In chemistry, "coke" refers to a solid carbonaceous material produced by heating coal in the absence of air. This process, called carbonization, drives off volatile components like water, hydrocarbons, and sulfur, leaving behind a high-carbon residue.

Here are some key characteristics of coke in chemistry:

* Composition: Primarily carbon (around 85-95%), with varying amounts of ash, sulfur, and other impurities.

* Appearance: Hard, brittle, and porous with a gray-black color.

* Properties: High melting point, good electrical conductivity, and high reactivity.

* Uses:

* Iron and Steel Production: As a fuel and reducing agent in blast furnaces to convert iron ore into iron.

* Other Industrial Applications: As a fuel for various industrial processes, as a component in electrodes, and in the production of certain chemicals.

It's important to note that "coke" in chemistry is distinct from the popular beverage "Coca-Cola."