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WorksheetsReaction Rate Laws
Total questions: 25
Worksheet time: 25mins
Increase in temperature of the reactants can do one of the following
Slow collision frequency
Allow less effective collision between the particles
Cause particles to lose speed
Increase collision between the particles thus increasing the rate.
Why does a higher temperature increase the rate of a reaction?
it increases both the frequency and energy of particle collisions
it only increases the frequency of particle collisions
it only increases the energy of particle collisions
it reduces the activation energy of the reaction
Products will form faster if____________
the particle size of the reactants are larger.
temperature is decreased.
concentration of the reactants are increased.
the reaction is not stirred.
The major theory of reaction rate is called
Collision theory
Crash theory
Newton's laws
Thermodynamics
which factor that affect reaction rate is represented?
Temperature
Catalyst
Surface Area
Concentration
Which of the following factors does NOT affect the rate of a chemical reaction?
Concentration of reactants
Presence of a catalyst
Color of reactants
Temperature
According to the collision theory, what is necessary for a reaction to occur?
Particles must collide with sufficient energy and proper orientation
Particles must collide with any energy
Particles must collide with low energy
Particles must collide without any orientation
What is the rate law expression for a reaction with rate constant k and reactants A and B ?
Rate=k[A][B]
Rate=k[A]2[B]
Rate=k[A][B]2
Rate=k[A]2[B]2
In a first-order reaction, how does the rate of reaction change if the concentration of the reactant is doubled?
The rate doubles
The rate quadruples
The rate remains the same
The rate halves
What is the unit of the rate constant k for a second-order reaction?
mol−1L s−1
mol L−1s−1
L mol−1s−1
s−1
Which of the following statements is true about catalysts?
They increase the activation energy of a reaction
They are consumed in the reaction
They provide an alternative pathway with lower activation energy
They decrease the concentration of reactants
What happens to the rate of a reaction if the surface area of a solid reactant is increased?
The rate increases
The rate decreases
The rate remains the same
The rate becomes zero
Which of the following is a method to determine the rate of a reaction experimentally?
Measuring the change in color over time
Measuring the change in temperature over time
Measuring the change in pressure over time
All of the above
What is the effect of a temperature increase on the rate constant k of a reaction?
k increases
k decreases
k remains the same
k becomes zero
In the rate law Rate=k[A]m[B]n , what do m and n represent?
The stoichiometric coefficients of the reactants
The order of the reaction with respect to each reactant
The total number of reactants
The equilibrium constant
Which of the following reactions is likely to have the fastest rate?
A reaction with a high activation energy
A reaction with a low activation energy
A reaction with no activation energy
A reaction with a moderate activation energy
What is the role of a catalyst in a chemical reaction?
To increase the concentration of reactants
To decrease the concentration of products
To lower the activation energy
To increase the activation energy
How does the presence of a catalyst affect the equilibrium position of a reaction?
It shifts the equilibrium to the right
It shifts the equilibrium to the left
It does not affect the equilibrium position
It stops the reaction
What is the relationship between the rate of a reaction and the concentration of reactants in a zero-order reaction?
The rate is independent of the concentration
The rate is directly proportional to the concentration
The rate is inversely proportional to the concentration
The rate is exponentially related to the concentration
Which of the following is an example of a first-order reaction?
Radioactive decay
Combustion of methane
Formation of water
Photosynthesis
What is the effect of increasing pressure on the rate of a reaction involving gases?
The rate increases
The rate decreases
The rate remains the same
The rate becomes zero
In a reaction mechanism, what is the slowest step called?
The rate-determining step
The equilibrium step
The fast step
The intermediate step
What is the significance of the Arrhenius equation in reaction kinetics?
It relates the rate constant to temperature and activation energy
It relates the rate constant to pressure and volume
It relates the rate constant to concentration and time
It relates the rate constant to the equilibrium constant
Which of the following factors can change the rate constant k of a reaction?
Concentration of reactants
Temperature
Presence of a catalyst
All of the above
What is the effect of a catalyst on the activation energy of a reaction?
It lowers the activation energy
It raises the activation energy
It has no effect on the activation energy
It doubles the activation energy
