Steady-State Approximation

AP Chemistry· difficulty 4/5

time [I]

A reactive intermediate I has [I] that quickly rises and then stays roughly constant. This justifies which approximation?

  • A

    Equilibrium approximation only

  • B

    Zero-order assumption

  • C

    Catalytic cycle assumption

  • D

    Steady-state approximation

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Explanation

When d[I]/dt ≈ 0 because formation and consumption rates balance, the steady-state approximation applies.

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