Endo_Exo_and_enzymes.pptx - Exothermic and Endothermic Reactions Energy and Chemical Reactions \u2022 Chemical Energy \u2013 Energy stored in the chemical

Endo_Exo_and_enzymes.pptx - Exothermic and Endothermic...

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Exothermic and Endothermic Reactions
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Energy and Chemical Reactions Chemical Energy – Energy stored in the chemical bonds of a substance. Chemical reactions always involve energy changes. Making bonds and breaking bonds involve energy changes
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Activation Energy The energy required to break the bonds in the reactants for a chemical reaction to occur.
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Endothermic and Exothermic reactions Step 1: Energy must be SUPPLIED to break chemical bonds of reactants: Step 2: Energy is RELEASED when new chemical bonds are made in the products: A reaction is EXOTHERMIC if more energy is RELEASED than SUPPLIED . If more energy is SUPPLIED than is RELEASED then the reaction is ENDOTHERMIC © Teachable . Some rights reserved.
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Energy of Chemical Reactions Based on the type of energy (heat) change involved, chemical reactions are classified as either exothermic or endothermic . Exothermic : energy is released Exo- = “exit” Burning of gasoline Endothermic : energy is absorbed Endo- = “into” Cooking of pancakes
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Endothermic Diagram Energy absorbed in reaction Activation Energy Energy used in bond breaking Endothermic – more energy is taken in to break the bonds in the reactants than released by the bonds being formed in the products. Therefore, energy is absorbed.
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  • Fall '14
  • Enzyme, Chemical reaction

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