15. Chemical Kinetics

Half-Life

객관식
What is the half-life of radon-220?
115
views
객관식
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.
1856
views
8
rank
6
comments
객관식
For a first-order reaction, what percentage of the reactant has been consumed after one half-life has elapsed?
131
views
객관식
In a first-order reaction, what fraction of the original reactant has been consumed after 4 half-lives?
62
views
객관식
How much of a radioactive parent isotope will remain after three half-lives have passed?
643
views
객관식
If a sample initially contains 1.0 × 10^{12} atoms of the cadmium isotope 109Cd, which has a half-life of 462 days, approximately how many atoms of 109Cd will remain after 924 days?
95
views
객관식
Which of the following is the correct formula for calculating the age of a meteorite using half-life?
115
views
객관식
A radioactive isotope decays such that after 24 hours, only 25% of the original sample remains. What is the half-life of this isotope?
113
views
객관식
Which of the following best describes the possible range of half-lives for radioactive isotopes?
97
views
객관식
If 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?
621
views
객관식
After 5 half-lives have passed for 87Rb, what percentage of daughter isotopes would be present?
81
views
객관식
If the decay constant for element X is 6.931 yr^{-1}, what is its half-life?
89
views
객관식
Iodine-131 has a half-life of 8.0 minutes. How many half-lives will pass in 120 minutes?
118
views
객관식
Which statement accurately describes a half-life?
92
views
객관식
The half-life of bromine-74 is 25 min. How much of a 4.0 mg sample remains after 75 min?
111
views