Question

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which is the best definition of activation energy? the energy required to re-form bonds in product molecules the energy required to end a chemical reaction the energy required to bind a substrate to an active site the energy required to form or break the bonds of reactant molecules

Explanation:

Activation energy is defined as the minimum energy that reactant molecules must possess to undergo a chemical reaction. This energy is required to form or break the bonds of reactant molecules, allowing the reaction to proceed. Let's analyze the options:

• The first option ("the energy required to reform bonds in product molecules") is incorrect because activation energy is about reactants, not reforming product bonds.
• The second option ("the energy required to end a chemical reaction") is incorrect as activation energy is for starting, not ending, a reaction.
• The third option ("the energy required to bind a substrate to an active site") describes enzyme - substrate binding energy, not activation energy.
• The fourth option ("the energy required to form or break the bonds of reactant molecules") matches the definition of activation energy.

Answer:

the energy required to form or break the bonds of reactant molecules