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The dreaded “popcorn” problem … This is a 2 step problem PowerPoint PPT Presentation


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Step 1 “ Popcorn kernels pop unimolecularly …”. The dreaded “popcorn” problem … This is a 2 step problem. = first-order reaction ln ( A) - ln (A 0 ) = - k t. determine k first.

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The dreaded “popcorn” problem … This is a 2 step problem

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The dreaded popcorn problem this is a 2 step problem

  • Step 1

  • “Popcorn kernels pop unimolecularly…”

  • The dreaded “popcorn” problem…

  • This is a 2 step problem

= first-order reaction

ln(A) -ln(A0) = -kt

determine k first

  • 29 kernels pop in 10 seconds when 400 total kernels are present. After 100 have popped, how many will pop over the next 10 seconds?

  • 29 kernels pop in 10 seconds when 400 total kernels are present.After 100 have popped, how many will pop over the next 10 seconds?

  • A0 = 400(initial number of kernels)

  • t = 10 sec

  • A = 371 (number of kernels at time t)

  • k = 0.00753 sec-1


The dreaded popcorn problem this is a 2 step problem

  • Step 2

  • Start over with a new initial condition

  • 1st ORDER: ln(A) -ln(A0) = -kt

  • and k = 0.00753 sec-1

  • After 100 have popped, how many will pop over the next 10 seconds?

  • A0 = 300(initial number of kernels)

  • t = 10 sec

  • k = 0.00753 sec-1

  • Answer: 300-278.25 = 22.75


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