A substance that influences the reaction but does not participate in the reaction is a ________________.

Step 1: Define the Problem

Identify the term used for a substance that affects a reaction without being consumed or altered in the process.

Step 2: Break Down the Problem

• Determine the role of the substance in the reaction.
• Identify the characteristics of such a substance.

Step 3: Apply Relevant Concepts

• A substance that influences the rate of a chemical reaction without undergoing any permanent chemical change itself is known as a catalyst.

Step 4: Analysis, Verify and Summarize

• Catalysts work by providing an alternative reaction pathway with a lower activation energy.
• They are not consumed in the reaction, meaning they can be used repeatedly.

Final Answer

A substance that influences the reaction but does not participate in the reaction is a catalyst.