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State whether the following is true or false.
An apparent activation energy about half the true chemical value points to pore diffusion control.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: B

The observed rate then depends on the square root of the rate constant, which halves the apparent activation energy. It is one of the simplest and most useful diagnostics available. A square root halves the exponent. The test costs nothing beyond the data already taken.

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