Chemical Kinetics - SS2 Chemistry Past Questions and Answers - page 1
Which of the following factors can affect the rate of a chemical reaction?
Temperature
Catalyst
Concentration of reactants
All of the above
The rate of a chemical reaction is determined by:
The concentration of the products
The concentration of the reactants
The concentration of the catalyst
The overall reaction order
Which statement is true about catalysts?
They increase the overall energy of the reaction.
They are consumed during the reaction.
They decrease the rate of reaction.
They provide an alternative reaction pathway.
A reaction has a rate law of Rate = k [A]2 [B]. If the concentration of A is doubled and the concentration of B is tripled, how will the rate of the reaction change?
The rate will remain the same.
The rate will be doubled.
The rate will be quadrupled.
The rate will increase by a factor of six.
What is the overall reaction order for a reaction with the following rate law: Rate = k [X]2 [Y]1/2?
1
2
3/2
2.5
Which of the following is a unit for the rate constant (k) in a first-order reaction?
mol/L
s-1
L/(mol·s)
L/mol
At a higher temperature, the rate of a chemical reaction generally:
Decreases
Remains the same
Doubles
Increases
For a gaseous reaction, an increase in pressure will lead to an increase in the reaction rate when the reaction involves:
A decrease in the number of moles of gas
An increase in the number of moles of gas
No change in the number of moles of gas
A change in the volume of the container
Which of the following reactions is likely to have the fastest rate?
A reaction with a large activation energy
A reaction with a small activation energy
A reaction with a high-energy transition state
A reaction with a stable intermediate
In a reaction mechanism, the slowest step is known as the:
Catalyst step
Rate-determining step
Intermediate step
Equilibrium step