All topicsAn irreversible reaction A + B → products is studied under conditions where the initial concentrations of A an2018 national · question 287%A reaction A ⇌ B is reversible, with Keq = 1.00. The forward reaction is first-order in A. In a reaction initi2020 national · question 2926%The isotope actinium-226 undergoes both beta decay, with a half-life of 35.4 d, and electron capture, with a h2022 national · question 2527%
Kinetics
This is block 5 of 10, questions 25–30 on both the local section exam and national Part I. Across the 41 national questions where ACS published item statistics, qualifiers answered 56% correctly, which makes it the ninth hardest of the 10.
What it covers
rate lawsintegrated rate lawshalf-lifeArrhenius equationmechanismscatalysisreaction coordinate diagrams
Where qualifiers lose points
% who got it rightThese are the kinetics questions the fewest national qualifiers answered correctly. If you can do these, the block is not your problem.
Every question is from a published past exam and carries its source. Practice adapts to what you miss, and anything you get wrong comes back on a spaced schedule. No account needed. See the other nine blocks.