07:09Half-life of a second-order reaction | Kinetics | Chemistry | Khan AcademyKhan Academy Organic Chemistry610views
08:16Half-life of a first-order reaction | Kinetics | AP Chemistry | Khan AcademyKhan Academy Organic Chemistry741views
Multiple ChoiceDecomposition 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.641views1rank4comments
Multiple ChoiceRadioactive 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?1539views1rank1comments
Multiple ChoiceUse the data below to determine the half-life of decomposition of NOCl reaction which follows 2nd order kinetics.838views3comments
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≡N454views
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?450views
Open QuestionHow long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration?"449views
Open QuestionWhat is the rate constant of a first-order reaction when 20.0% of a reactant remains after 30.0 s?289views
Open QuestionWhat is the half-life for a particular reaction if the rate law is rate = (1301 min-1)[A]?274views
Open Questiona. What is the half-life for the first-order decomposition of SO2Cl2 with a rate constant of 1.42 x 10^-4 s^-1? b. How long will it take for the concentration of SO2Cl2 to decrease to 25% of its initial concentration? c. If the initial concentration of SO2Cl2 is 1.00 M, how long will it take for the concentration to decrease to 0.78 M? d. If the initial concentration of SO2Cl2 is 0.150 M, what is the concentration of SO2Cl2 after 2.00 x 10^2 s? After 5.00 x 10^2 s?
Open QuestionThe decomposition of XY is second order in XY and has a rate constant of 7.02 * 10^-3 M^-1 s^-1 at a certain temperature. b. How long will it take for the concentration of XY to decrease to 12.5% of its initial concentration when the initial concentration is 0.100 M? When the initial concentration is 0.200 M? c. If the initial concentration of XY is 0.150 M, how long will it take for the concentration to decrease to 0.062 M? d. If the initial concentration of XY is 0.050 M, what is the concentration of XY after 5.0 * 10^1 s? After 5.50 * 10^2 s?
Open QuestionThe desorption (leaving of the surface) of a single molecular layer of n-butane from a single crystal of aluminum oxide is found to be first order with a rate constant of 0.128 s−1 at 150 K. If the surface is initially completely covered, what fraction will remain covered after 10 s? After 20 s?
Open QuestionWhat fraction of the film is left after 10 s, assuming the same initial coverage as in part a, given that the evaporation of a 120-nm film of n-pentane from a single crystal of aluminum oxide is zero order with a rate constant of 1.92 * 10^13 molecules/cm^2 * s at 120 K?
Open QuestionHow old is a rock that contains 83.2% of the amount of uranium-238 it contained when it was formed?
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