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Correct Answer: A
Correct Answer: A
Method / Topic: General Chemistry
The correct option matches the required rule and the given information.
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Correct Answer: A
Method / Topic: General Chemistry
The concentration halves from 0.800 M to 0.400 M in 10 minutes and halves again from 0.400 M to 0.200 M in another 10 minutes. A constant half-life is the characteristic integrated-rate behavior of a first-order reaction. Therefore rate = k[H2O2]. A zero-order reaction would lose equal concentration amounts in equal times. This result follows from the balanced chemical relationship and the stated conditions; no unstated biological assumption is needed. On MCAT chemistry problems, first identify the governing principle, write the relevant equation with units, and only then substitute values. Check whether the
prevents dosage, dilution, and preparation errors.
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PASSAGE 2 — HYDROGEN PEROXIDE DECOMPOSITION Hydrogen peroxide decomposes as 2H2O2(aq) → 2H2O(l) + O2(g). In one trial at 298 K and 1.00 atm, a catalyst causes a sample to release 24.6 mL of O2. Use R = 0.0821 L·atm·mol−1·K−1. In a separate kinetics experiment, the H2O2 concentration falls from 0.800 M to 0.400 M in 10 minutes and from 0.400 M to 0.200 M during the next 10 minutes. QUESTION 5: The concentration data are most consistent with which rate law?
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Correct Answer: A
Method / Topic: General Chemistry
The correct option matches the required rule and the given information.
Short Explanation
Detailed Explanation
Correct Answer: A
Method / Topic: General Chemistry
The concentration halves from 0.800 M to 0.400 M in 10 minutes and halves again from 0.400 M to 0.200 M in another 10 minutes. A constant half-life is the characteristic integrated-rate behavior of a first-order reaction. Therefore rate = k[H2O2]. A zero-order reaction would lose equal concentration amounts in equal times. This result follows from the balanced chemical relationship and the stated conditions; no unstated biological assumption is needed. On MCAT chemistry problems, first identify the governing principle, write the relevant equation with units, and only then substitute values. Check whether the
prevents dosage, dilution, and preparation errors.
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