Multiple Choice
How much of a radioactive parent isotope will remain after three half-lives have passed?
15. Chemical Kinetics
Half-Life
Back15. Chemical Kinetics
Half-Life
- Multiple ChoiceThe graph below shows the decay of a radioactive isotope. What is the half-life of the isotope?
- 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.
- Multiple Choice
Radioactive plutonium-239 (t1/2 = 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?
- Multiple Choice
Use the data below to determine the half-life of decomposition of NOCl reaction which follows 2nd order kinetics.
- Multiple ChoiceThe 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 - Multiple ChoiceWhat 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?
- Open Question
How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration?"
- Open Question
What is the rate constant of a first-order reaction when 20.0% of a reactant remains after 30.0 s?
- Open Question
What is the half-life for a particular reaction if the rate law is rate = (1301 min-1)[A]?
- Multiple Choice
Which of the following statements is False?
- Multiple ChoiceFor the hypothetical second-order reaction: A → products, the general rate law is: rate = k[A]². How long is the third half-life of the reaction if [A]₀ is 0.080 M and the first half-life is 22 minutes?
- Multiple ChoiceIn the reaction 3 BrO-(aq) → BrO3-(aq) + 2 Br-(aq), a plot of 1/[BrO-] vs. time is linear with a slope of 0. What does this indicate about the order of the reaction with respect to BrO-?
- Multiple ChoiceIf the initial concentration of NO2(g) is 0.050 M, what is the half-life of the reaction at 300°C given that the rate constant k is 0.54 M⁻¹s⁻¹?