Next Step Exam Q

[treeclimbingmonkey]

Hi I legit don't get this question, would it be possible for someone to help me understand why the answer is first order kinetics?
Thank you very much!

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[PlsLetMeIn21]

They want you to notice that rate = k [H+] because of two entries in the table: 1.32 = k[0.1] and 0.01 = k[0.001]. 1.32/0.01 = 132 and 0.1/0.001 = 100. Because 100 to the first power is kind of close to 132, it's a first order relationship. It's a leap of faith conclusion without knowing the impact of other variables to say the overall rate is first order, but it is close enough to first order with respect to H+ to conclude first order dependence on H+.

Honestly, that's a bad question for many reasons, but of the answer choices, B is the only one that can be supported (somewhat) by the table. It's the least worst answer. I wouldn't worry too much about this on the real deal. The questions on your actual MCAT will be better.

 

[treeclimbingmonkey]

They want you to notice that rate = k [H+] because of two entries in the table: 1.32 = k[0.1] and 0.01 = k[0.001]. 1.32/0.01 = 132 and 0.1/0.001 = 100. Because 100 to the first power is kind of close to 132, it's a first order relationship. It's a leap of faith conclusion without knowing the impact of other variables to say the overall rate is first order, but it is close enough to first order with respect to H+ to conclude first order dependence on H+.

Honestly, that's a bad question for many reasons, but of the answer choices, B is the only one that can be supported (somewhat) by the table. It's the least worst answer. I wouldn't worry too much about this on the real deal. The questions on your actual MCAT will be better.

Thank you so much!!