______ of a reaction is given by the total number of molecules of the reactants taking part in the reaction.
Rate
Order
Molecularity
Power
A first order reaction is found to have a rate constant equal to 6.93 x 10 -14 sec -1. The half life of the reaction is
3.42 x 10 -14 sec -1
3.42 x 10 14 sec
1 x 10 15 sec
1 x 10 13 sec
________ step in the sequence of elementary reactions determines the measured reaction rate.
First
Last
Slowest
Fastest
_________ occurs when each of the two atoms joined by a covalent bond keeps one of the two bond forming electrons.
Homolysis
Heterolysis
Pyrolysis
Hydrolysis
_________ is an electron pair donar that reacts at centers of positive charge.
Nucleophile
Electro phile
Hydrophilic
Lyophilic
The activity of solid catalysts is often considerably increased in the presence of small quantities of certain substances. Such substances are known as
Promotors
Inhibitors
Reactivating
Specific
According to the theory of ________ the catalyst undergoes a chemical change by reaction with a reactant, either in the rate determining step or in an earlier rapid step.
Homogeneous catalysis
Heterogeneous catalysis
Reacting species
Equilibrium
A _________ Catalyst is in the same phase as reactants.
Homogeneous
Heterogeneous
Negative
Inhibiting
________ is the rate of change of concentration of a particular reactant or product over a very small time interval.
Average rate
Instantaneous rate
Overall rate
Medium rate
__________ equation represents the half life of a first order reaction.
t 1/2= 0.693/k
t 1/2 = k/0.693
+ 1/2 = 0.693 x k
K = 0.693 x t 1/2
