Rate Constant (k): The proportionality constant in the equation that expresses the relationship between concentrations and rates. It's like knowing exactly how fast you'll go down that frictionless slide every single time.
Rate-Determining Step:The slowest step in a reaction mechanism, which determines the overall rate of the reaction. It's like the most challenging part of an obstacle course that slows down your overall time.
Catalyst:A substance that increases the rate of a chemical reaction without being consumed in the process. It's like adding a boost to your slide to make you go faster!