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This graph shows the concentration of the reactant Ain the reaction A B. 10pts. 0.8 0.6 0.4 0 10 20 30 40 50 60 70 80 Time (s) What is the average rate of the reaction between 0 and 10 seconds? What is the instantaneous rate at 60 seconds? 19) Consider the graph below: (5pts) Time a) Is X a reactant or a product? b) Is the rate of the reaction speeding up, slowing down, or not changing (static)? c) which is greater? The average rate between points 1 & 2 or the average rate between points 2 & 3.

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Answer #1

Average rate:

dC/dt = C2-C1/(dt2-dt1) = (0.82-1)/(10-0) = -0.018 M/s

instantaneous rate at 60 s...

average between next 2 points:

dC/dt = C2-C1/(dt2-dt1) = (0.36-0.40)/(100) = -0.0004 M/s

dC/dt = C3-C2/(dt3-dt2) = (0.40-0.48)/(100) = -0.0008M/s

average = 0.0006 M/s

Q19

X must be a reactant, since it sconcentration is being lowered as time passes by

b

the rate is going slower, since the "slope" at initial times is steep

vs. the last time, which has almost a flat slope

c

absolute greater --> difference betwen 1-2 is greater than thatn of 2-3

(rate is slowing down)

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