Kinetics Comparison  

Students build a model of a zero, then first and finally second order reaction. The model shown here combines the three. Students can then compare the effects on the graph.

THE MODELS
Vensim Version STELLA Version

[Diagram Level | Equations Level | Graphs ]



First_A(t) = First_A(t - dt) + (- Rate_decompose_first_A) * dt
INIT First_A = 5

OUTFLOWS:
Rate_decompose_first_A = First_A*Rate_constant
Second_A(t) = Second_A(t - dt) + (- Rate_decompose_second_A) * dt
INIT Second_A = 5

OUTFLOWS:
Rate_decompose_second_A = Rate_constant*Second_A^2
Zero_A(t) = Zero_A(t - dt) + (- Rate_decompose_zero_A) * dt
INIT Zero_A = 5

OUTFLOWS:
Rate_decompose_zero_A = Rate_constant
Rate_constant = 0.1

Time Specs
Range: 0-12 , dT = 0.25 , Integration Method = Euler


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