A substance that changes the rate of a reaction but remains chemically…

Question

A substance that changes the rate of a reaction but remains chemically unchanged at the end is called:

Accepted Answer

D. {'text': 'A catalyst'}

1. Reactants are consumed and products are formed during a reaction.
2. A substance that alters the rate yet is not consumed is a **catalyst**.
3. Catalysts can be positive (speed up) or negative (slow down).
4. Example: MnO₂ speeds up the decomposition of KClO₃.
_Source: Selina Concise ICSE Class 8 Chemistry Ch 6 "Chemical Reactions", Catalysts classification_

Answer

{'text': 'A reactant'}

Answer

{'text': 'A product'}

Answer

{'text': 'A precipitate'}