a substance that influences the reaction but does not participate in the reaction is a\ncatalyst\nreactant\np…
a substance that influences the reaction but does not participate in the reaction is a\ncatalyst\nreactant\nproduct\nsubstrate
Answer
Brief Explanations:
A catalyst speeds up a chemical reaction by providing an alternative reaction pathway with lower activation energy, without being consumed or participating in the overall reaction. Reactants are substances that take part in a reaction, products are the substances formed from the reaction, and a substrate is a substance acted upon by an enzyme (a type of catalyst in biological systems but more specific).
Answer:
A. catalyst