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Energy Diagrams quiz

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  • What does an energy diagram illustrate in a chemical reaction?
    It shows the energies of reactants, products, and the transition state as the reaction progresses.
  • Where are reactants and products located on an energy diagram?
    Reactants are at the beginning (left) of the curve, and products are at the end (right) of the curve.
  • What is the transition state in an energy diagram?
    The transition state is the peak energy point between reactants and products, also called the activated complex.
  • What does the x-axis represent in an energy diagram?
    The x-axis shows the reaction coordinate, which is the progress of the reaction.
  • What does the y-axis represent in an energy diagram?
    The y-axis represents the change in energy during the reaction.
  • How is activation energy (E_a) defined in an energy diagram?
    Activation energy is the minimum energy required for a reaction, calculated as the difference between the transition state and reactants.
  • How does activation energy affect the speed of a reaction?
    Higher activation energy results in a slower reaction, while lower activation energy leads to a faster reaction.
  • How do you calculate activation energy from an energy diagram?
    Activation energy equals the energy of the transition state minus the energy of the reactants.
  • What is the overall energy change (ΔE) in a reaction?
    ΔE is the difference between the energy of products and reactants, calculated as products minus reactants.
  • What does enthalpy (ΔH) represent in a chemical reaction?
    Enthalpy is the thermal energy change during a reaction, specifically related to heat.
  • What does Gibbs free energy (ΔG) indicate about a reaction?
    Gibbs free energy shows the favorability of product formation; negative ΔG means the reaction is favorable.
  • What does a negative ΔH value indicate about a reaction?
    A negative ΔH means the reaction is exothermic, releasing energy.
  • What does a positive ΔH value indicate about a reaction?
    A positive ΔH means the reaction is endothermic, absorbing energy.
  • What does a negative ΔG value indicate about a reaction?
    A negative ΔG means the reaction is exergonic and favorable, with products more stable than reactants.
  • What does a positive ΔG value indicate about a reaction?
    A positive ΔG means the reaction is endergonic and unfavorable, with products less stable than reactants.