13 terms

Reaction Rates & Equilibrium

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.