Apentix/AP Chemistry/Unit 5: Kinetics/Question

AP Chemistryeasymcq1 pt

Kineticists usually quote the 'initial rate' of a reaction. What does the initial rate correspond to?

A.The slope of the tangent to the concentration-time curve at time zero

B.The average rate over the entire reaction

C.The rate after exactly one half-life has passed

D.The largest rate the reaction ever reaches

Explanation

Core Concept

The initial rate is measured in the first moments of the reaction, effectively the tangent slope at t = 0. At that point the reactant concentrations are known most precisely and have barely changed from their prepared values. Product levels are still negligible, so interfering reverse processes are minimal. This makes the initial rate the cleanest snapshot of how rate depends on known concentrations.

Correct Answer

AThe slope of the tangent to the concentration-time curve at time zero

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