- [Medium]Define how the threshold energy of a reaction is related to the activation energy and the average energy of the reactant molecules....
- [Easy]Radioactive decay obeys first order kinetics; if a sample has a half-life of 5 years, what percentage remains after 15 years approximately?...
- [Medium]How is the instantaneous rate of a reaction obtained from a graph of concentration plotted against time during the course of the reaction?...
- [Easy]Why does increasing the concentration of reactants generally increase the rate of a reaction in terms of molecular collisions occurring per second?...
- [Medium]For a zero order reaction with initial concentration 0.10 M and rate constant 0.005 mol L^-1 s^-1, what is the half-life of the reaction?...
- [Easy]The rate of a typical reaction approximately doubles for every ten degree rise in temperature; what name is given to this ratio of rate constants?...
- [Easy]According to collision theory, why do only a small fraction of molecular collisions actually result in the formation of products?...
- [Medium]A plot of the natural logarithm of reactant concentration against time gives a straight line with negative slope; what does this indicate about the re...
- [Easy]What are the units of the rate constant for a reaction that is found experimentally to be second order overall?...
- [Medium]Distinguish between order and molecularity by deciding which quantity can be fractional for a multistep complex reaction....
- [Easy]How does a positive catalyst increase the rate of a chemical reaction without itself being consumed in the overall process?...
- [Medium]Why does the rate of a zero order reaction remain unchanged even when the concentration of the reactant is reduced substantially during the process?...
- [Medium]For the reaction in which nitrogen reacts with hydrogen to form ammonia, how does the rate of disappearance of hydrogen relate to the rate of formatio...
- [Easy]The half-life of a first order reaction is 20 minutes; what fraction of the original reactant remains after 60 minutes have elapsed?...
- [Medium]A first order reaction has a rate constant of 2.303 × 10^-3 s^-1; how long will it take for the reactant concentration to fall to one-tenth of its ini...
- [Easy]If doubling the concentration of a reactant quadruples the reaction rate while other concentrations stay fixed, what is the order with respect to that...
- [Easy]For a first-order reaction, the integrated rate law is:...
- [Easy]In a multi-step reaction, the rate of overall reaction is determined by:...
- [Easy]A catalyst increases the rate of reaction by:...
- [Easy]Radioactive decay follows:...
- [Easy]According to collision theory, the rate of reaction increases with temperature because:...
- [Medium]For a second-order reaction with equal initial concentrations of reactants, the half-life is:...
- [Easy]The molecularity of a reaction can be:...
- [Easy]Enzyme catalysis is an example of:...
- [Medium]Hydrolysis of ethyl acetate in presence of excess water follows pseudo first-order kinetics because:...
- [Easy]For a zero-order reaction, the plot of concentration vs time is:...
- [Easy]A 10°C rise in temperature doubles the rate of a reaction. The temperature coefficient of the reaction is:...
- [Easy]For a first-order reaction, the half-life is 20 minutes. The time required for 75% completion is:...
- [Easy]According to the Arrhenius equation, the rate constant k is related to activation energy Ea by:...
- [Medium]For the reaction 2A + B → 3C, if the rate of disappearance of A is 0.6 mol L⁻¹ s⁻¹, the rate of formation of C is:...
- [Easy]For a reaction A + 2B → C, the rate law is r = k[A][B]². The order of reaction is:...