Potential Energy Diagrams

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Created by
Angela Chan

Cards (11)

  • Irreversible reaction: Chemical reactions that take place in one direction only (only forward) Reactants -› products
    Reaction takes place until at least one reactant is used up Direction: Left ----> Right
  • Reversible reactions: Chemical reactions that take place in both directions (forward and reverse direction) Direction: Right ----> Left
    reactants are not completely converted to products
    As products form, products collide and reform reactants; Symbol 2 arrows
  • Forward reactions: asks about the reaction or forward reaction
    Example: determine activation energy for the reaction or What is the activation for the forward reaction
  • Reverse reaction: It MUST say REVERSE REACTION!
    Example: determine activation energy for the reverse reaction
  • The addition of a catalyst lowers the activation energy and increases the rate of the reaction by 1) Lowering the activation energy
    2) providing an alternate lower pathway for a reaction to occur
  • Compared to uncatalyzed Value for catalyzed will be
    1 )Reactants PE: Same
    2)Activated complex PE: Lower
    3)Heat of reaction: same 4)Activation Energy PE. Lower
  • Potential Energy Diagrams: Provide a visual for how a reaction proceeds and whether energy is released (exo) or absorbed(endo) during the reaction.
    • Products have lower PE than reactants
    • PUREX: Products under reactants are EXOTHERMIC
    • Products have higher PE than reactants
    • PARENT: Products above reactants are ENDOTHERMIC
  • Potential Energy(PE): Stored energy within the bonds of the reactants or products.
  • Activation Energy (Ea; energy of activation): Minimum energy reactants need to start a chemical reaction
    Activation energy (Activated complex- reactants)
  • Activated complex: The maximum energy point along the reaction path. Reactants Bonds rearrange to form products. an intermediate temporary product state during chem reaction.
  • Heat of reaction (Enthalpy) DELTA H : Energy released or absorbed during the chemical reaction.
    Formula DELTA H= PE of the products - PE of the reactants