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unit 7
Term | Definition |
---|---|
Entropy | measure of degree of randomness as particles move; more random more entropy |
Energy Change | using Hess's law; process equals the sum of the energy difference of products minus the sum of the energy difference of the reactants |
Chemical Equilibrium | Rate of forward reaction equals rate of reverse reaction and the concentrations of products and reactants remain unchanged |
Activated Complex | the maximum energy point along the reaction path |
Activation Energy | the minimum energy that must be input to a chemical system with potential reactants to cause a chemical reaction |
Collision Theory | qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions |
Catalyst | a substance that speeds up a chemical reaction, but is not consumed by the reaction |
Reversible reaction | Products can react to re-form the reactants |
(change in) H | enthalpy of products - enthalpy of reactants |
Hess's Law | Overall enthalpy change in a reaction is equal to the sum of the enthalpy changes for the individual steps in the process. |
Endothermic | Heat energy is absorbed; products higher |
Exothermic | Heat energy is absorbed; products higher |