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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Presentation Transcript

• Step 1

• “Popcorn kernels pop unimolecularly…”

• 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

• 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