The rate law for a first-order reaction is:

A Rate = k[A]²

B Rate = k[A]

C Rate = k

D Rate = k[A][B]

✓ Correct Answer: Option B

First-order: Rate depends linearly on one reactant concentration. Half-life is independent of initial concentration.

💡 Why is B) the correct answer?

The correct answer to the question "The rate law for a first-order reaction is:" is Option B: Rate = k[A].

The other options — A) Rate = k[A]², C) Rate = k, D) Rate = k[A][B] — are incorrect for this PCAT Exam Prep question. As explained above: First-order: Rate depends linearly on one reactant concentration. Half-life is independent of initial concentration.

📚 About This PCAT Exam Prep Practice Question

This 2-level PCAT Exam Prep question from the Chemical Processes topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free PCAT Exam Prep practice test or use flashcards for spaced repetition review.

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The rate law for a first-order reaction is:

✓ Correct Answer: Option B

📚 About This PCAT Exam Prep Practice Question

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