CLASSWORK Activity 1: Write only the word/term for each of the following descriptions next to the question number. 1.1. The change in concentration of reactants or products per time unit. 1.2. 1.3 1.4 1.5 A substance which speeds up a reaction, but is chemically unchanged at the end of the reaction . The minimum amount of energy needed for a chemical reaction to start Intermediate, short-lived group of atoms, before they form the product. Theory that explains the factors that influence reaction rates. Basically, the theory postulates that the rates of reactions depend on how often and how energetically the reacting molecules collide with each other.
