Acompound that speeds the rate of a chemical reaction but is not altered by the reaction

Catalyst

Explanation:

Catalyst is a compound that increases the rate of chemical reaction without itself being consumed or altered. It can be recovered chemically at the end of reaction.

It may be classified as,

-Homogeneous catalyst :in which the reaction mixture and the catalyst are in the same . This type of catalyst is used in oxidation

- Heterogeneous catalyst : in which the reaction mixture and the catalyst are in different phase. This type is used is Haber-Bosch process.

explanation: no but i do not usually comment

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