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Zorluk: KolayActivation Energy and Energy Profile Diagrams

Which of the following statements correctly describes the effect of adding a positive catalyst to a chemical reaction?

  1. It lowers the activation energy barrier by providing an alternative reaction pathway.Cevap
  2. B
    It shifts the equilibrium position to favor product formation.
  3. C
    It increases the overall enthalpy change (ΔH\Delta H) of the reaction.
  4. D
    It increases the potential energy level of the initial reactants.

Cevap

A catalyst lowers the activation energy barrier by providing an alternative reaction pathway.
A positive catalyst increases the rate of reaction by providing an alternative pathway with a lower activation energy barrier, allowing more colliding particles to possess energy equal to or exceeding the activation energy.

Adım Adım Çözüm

1
Identify the role of a catalyst in chemical kinetics.
A catalyst speeds up a reaction without being consumed.
By introducing an alternative mechanism, the activation energy (EaE_a) peak on the energy profile diagram is lowered.
2
Distinguish between kinetic effects and thermodynamic properties.
Thermodynamic properties like enthalpy change (ΔH\Delta H) and equilibrium position remain unaffected.
The initial energy of reactants and final energy of products remain constant regardless of whether a catalyst is present.

Anahtar Kavram

Effect of a Catalyst on Activation Energy and Energy Profile Diagrams
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Konular

Activation Energy and Energy Profile Diagrams