A reaction proceeds via a two-step mechanism. The first step is a fast, reversible equilibrium with a small equilibrium constant. The second step is slow. Which of the following is MOST likely true about the overall reaction rate?
The overall rate will be determined solely by the rate of the slow step.
The overall rate will be independent of the concentration of the intermediate.
The overall rate will be dependent on the concentrations of the reactants in both steps.
The equilibrium constant of the first step will have no effect on the overall rate.
Related Questions
Effective collisions are those in which molecules must:
Have energy equal to or greater than the threshold energy
Have proper orientation
Acquire the energy of activation
All of the above
The rate of reaction increases with temperature due to
Decrease in activation energy
Increase in activation energy
Increase in collision frequency
Increase in concentration
Activation energy of a reaction is:
The energy released during the reaction
The energy evolved when activated complex is formed
Minimum amount of energy needed to overcome the potential barrier of reaction
The energy needed to form one mole of the product
Increasing the temperature generally increases the reaction rate because:
The activation energy decreases
More molecules have sufficient energy to react
The concentration of reactants increases
The molecules become larger
According to collision theory of reaction rates:
The rate of reaction depends only on the number of collisions between reactant molecules.
The rate of reaction depends only on the temperature of the reaction mixture.
The rate of reaction depends on the number of effective collisions, which involve both sufficient energy and proper orientation.
The rate of reaction depends only on the concentration of the reactant molecules.
Which increases on increase of temperature?
Rate of reaction
Activation energy
Equilibrium constant for an exothermic reaction
Concentration of reactants
The rate of chemical reaction depends on the nature of chemical reactions, because:
The threshold energy level differs from one reaction to another
Some of the reactants are solid at room temperature
Some of the reactants are coloured
All of the above
An endothermic reaction AโB has an activation energy as of . If energy change of the reaction is the activation energy of the reverse reactions is
Which of the following statement is in accordance with collision theory?
I. Rate is directly proportional to collision frequency
II. Rate depend upon orientation of atoms
III. temperature determines the rate
Only III
Only I and II
Only II and III
All of these
