AP Chemistrymediummcq1 pt
An experimental rate constant is reported as k = 0.75 M^-1*s^-1. What overall reaction order does this imply?
A.Second order overall
B.First order overall
C.Zero order overall
D.Third order overall
Explanation
Core Concept
Units of k must combine with the concentration factors to give rate in M*s^-1. For overall order n, k carries units of M^(1-n)*s^-1. Solving 1 - n = -1 gives n = 2, consistent with the reported M^-1*s^-1. Checking directly, k[A]^2 has units M^-1*s^-1 times M², which reduces exactly to M*s^-1.
Correct Answer
ASecond order overall
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