They are neither changed nor consumed during a reaction.
Types of these that are heterogeneous exist in different phases as the substance being reacted on, whereas types that are homogenous are in the same phase. They are neither changed nor consumed during a reaction. In the Haber process, iron serves as a heterogeneous type as the solid iron weakens the nitrogen bonds of the reactant gas to result in ammonia production. Enzymes are the biological type of, FTP, what chemical substances that accelerate reactions?
Types of these that are heterogeneous exist in different phases as the substance being reacted on, whereas types that are homogenous are in the same phase.
Catalyst