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What is the arrangement of atoms at the peak of an energy barrier?

Answer 1

It is the transition state, which is the very short-lived arrangement of atoms before any bonds have broken or formed yet.

It is the point that the reactants reach upon achieving enough energy to overcome the barrier to reactivity.

A transition state, which is how it sounds: it is the extremely short-lived orientation of the reactants before any bonds to be broken have broken and before any bonds to be made are made.

After it forms, the atoms transition to breaking or forming their bonds; old reactants are transformed into the new products in whichever way the mechanism works, and as they do that, we are looking at their going down the energy hill.

Usually, the transition state is hard to detect by non-advanced means because it is one of the highest-energy states a system of reactants achieves, if not the highest in energy.

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Answer 2
Mateo Aguilar
At the peak of an energy barrier, the arrangement of atoms typically involves a transition state where the atoms are in a temporary, unstable configuration as they transition from one stable state to another. This configuration often involves stretched or strained atomic bonds.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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