In a certain chemical reaction, substance combines with substance
to form substance . At the start of the reaction, the
quantity of present is grams, and the quantity of
present is grams. Assume and .
At time
seconds after the start of the reaction, the quantity of
present is grams. For certain types of reactions, the rate of
the reaction, in grams/sec, is given by
where is a positive constant.
1.
Sketch a graph of the rate against .
For what values of is the rate nonnegative?
Give your answer as a union of intervals, e.g.,
(-infinity,-a] U (a, 2b)
2.
Use your graph to find the value of at which the rate of the
reaction is fastest.
You can earn partial credit on this problem.