15. Chemical Kinetics

Half-Life

Multiple Choice
Decomposition of a certain substance Y at 45°C was found to be zero order. What is the half-life of substance Y if it took 15.5 minutes to decompose 67% of this substance? [Y]₀ = 0.25 M.
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Multiple Choice
Radioactive plutonium-239 (t_1/2 = 2.41 × 10⁵ yr) is used in nuclear reactors and atomic bombs. If there are 5.70 × 10² g of plutonium isotope in a small atomic bomb, how long will it take for the substance to decay to 3.00 × 10² g?
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Multiple Choice
Use the data below to determine the half-life of decomposition of NOCl reaction which follows 2nd order kinetics.
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Multiple Choice
The conversion of methyl isonitrile into acetonitrile follows first-order kinetics with a half-life of 110.2 seconds. What mass of a 1.00-g sample of methyl isonitrile remains after 10.0 minutes?

CH₃ – N≡C → CH₃ – C≡N
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Multiple Choice
What is the half-life of a second-order reaction in which 45.0% of the original concentration of 1.00 M remains after 325 seconds?
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Open Question
How long will it take for the concentration of SO₂Cl₂ to decrease to 25% of its initial concentration?"
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Open Question
What is the rate constant of a first-order reaction when 20.0% of a reactant remains after 30.0 s?
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Open Question
What is the half-life for a particular reaction if the rate law is rate = (1301 min^-1)[A]?
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Multiple Choice
Which of the following statements is False?
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