Amount of energy needed to weaken the existing bonds to an extent that can be broken through collision is called:
Correct answer: B. Activation energy
- A. Bond energy
- B. Activation energy
- C. Average energy
- D. Enthalpy
Explanation
Activation energy is the barrier reactant molecules must climb to reach the transition state, and only collisions carrying at least this much energy, with the right orientation, lead to reaction. Bond energy is the energy needed to break a particular bond completely in the gaseous state, a different quantity. A catalyst works by lowering the activation energy, not the bond energy.
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About Activation Energy and Activated Complex
Activation energy is the minimum energy reactant particles need to form the activated complex, or transition state, during a reaction. Energy profile diagrams show the forward and reverse activation energies, while catalysts provide an alternative pathway with lower activation energy without changing the reaction enthalpy.
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