Question

A student begins a kinetics experiment with a solution containing 0.050 % starch. At time zero (t = 0.00 min), the student adds an enzyme that catalyzes the decomposition of starch. At t = 1.00 min, the concentration of starch has decreased to 0.028 %. Compute the average rate of disappearance of starch. Specify your answer in units of % starch/min

Answer 1

Answer:

- 0.022% starch/min

Explanation:

Initial Conc. = 0.050 %

Final conc. = 0.028 %

Time = 1 min

Rate of Reaction = Rate of disappearance  = Change in concentration of starch  / time

Rate of disappearance = [0.028 - 0.050 ] / 1

Rate of disappearance = 0.022 / 1 = - 0.022% starch/min

The negative sign denotes that the starch is disappearing.

Answer 2

Based on the data provided, the rate of disappearance of starch is -0.022%/min

What is the rate of a reaction?

The rate of a reaction is the decrese in concentration of reactant molecules with time or the increase in concentration of products with time.

• Rate of reaction = change in concentration of reactant or product/ time

From the reaction given:

Decrease in concentration of starch = 0.028 - 0.050 = -0.022%

time taken = 1.0 min

Rate of disappearance of starch = -0.022%/1 min

Rate of disappearance of starch = -0.022%/min

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