Assertion: catalyst | /r/HasProperty | any chemical
Facets:
Source sentences:
text: A catalyst, as a general term can be any chemical, compound or element that speeds up a reaction when it is present.
text: The catalyst would be the chemical neither consumed or produced in a NET reaction and is a reactant in the first reaction of a series and is present as a product in the final of a series of reactions usually (it must not be consumed, and it must "get the ball rolling.")
text: A catalyst participates in the reaction but is neither a chemical reactant[?] nor a chemical product[?] .
text: For that reason the catalyst is referred to as "a chemical parson.