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Vocab review for Reaction Rates & Equilibrium Unit

reaction rate

rate at which reactants change into products over time

collision theory

states that chemical reactions occur through collisions between molecules or atoms

activation energy

the minimum amount of energy required to start a chemical reaction


substance that speeds up the rate of a chemical reaction


a substance that slows down or stops a chemical reaction

reversible reactions

a chemical reaction in which the reaction can proceed from reactants to products and from products to reactants

equilibrium position

the relative concentrations of the reactants and products at equilibrium

La Chatelier's Principle

if a system at equilibrium is subjected to a stress, the equilibrium is shifted in the direction that tends to relieve the stress

equilibrium constant

the ratio of product concentrations to reactant concentrations at equilibrium, with each concentration raised to a power equal to the number of moles of that substance in the balanced chemical equation

free energy

energy that is available to do work

spontaneous reactions

reactions that take little activation energy


a measure of the disorder of a system

Law of Disorder

States that the entropy of the universe must increase as a result of a spontaneous reaction or process.

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