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Unformatted text preview: Very unstable Lasts for an extremely short period of time Change in Enthalpy ( H) Heat of the reaction Represents energy Can be positive or negative H = products - reactants Exothermic Reactions: Reactions that release heat/energy into the surroundings. Products have less energy than the reactants (- H) The system loses energy as the reaction progresses A+B AB + heat Endothermic Reactions: Reactions that absorb heat/energy from the environment Products have more energy than reactants (+ H) The system gains energy as the reaction progresses Heat + A + B AB Conclusions: Energy of the universe is constant System is the reaction itself, surroundings is everything else (environment) Exothermic Reactions: release energy, products have less energy than reactants, heat is a product Endothermic Reactions: absorb energy, products have more energy than reactants, heat is a reactant...
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