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Chemical Kinetics : Chemistry
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Question 1 of 36
What is the rate law expression for a first-order reaction?
Choose 1 answer
Rate = k[A]^2
Rate = k[A][B]
Rate = k[A]
Rate = k[A]^2[B]
Question 2 of 36
In which order of reaction does the rate of reaction depend on the concentration of only one reactant raised to the first power?
Choose 1 answer
Zero-order
First-order
Second-order
Third-order
Question 3 of 36
The half-life of a reaction is constant for which order of reaction?
Choose 1 answer
Zero-order
First-order
Second-order
Third-order
Question 4 of 36
Which of the following factors does NOT affect the rate of a chemical reaction?
Choose 1 answer
Temperature
Concentration
Pressure
Color of reactants
Question 5 of 36
What is the unit of the rate constant for a second-order reaction?
Choose 1 answer
s^-1
L/mol·s
L^2/mol^2·s
mol/L·s
Question 6 of 36
The Arrhenius equation relates the rate constant of a reaction to which of the following?
Choose 1 answer
Temperature
Pressure
Concentration
Volume
Question 7 of 36
Which term describes a reaction mechanism that involves a sequence of elementary steps?
Choose 1 answer
Complex reaction
Elementary reaction
Unimolecular reaction
Multistep reaction
Question 8 of 36
What does the term 'activation energy' refer to?
Choose 1 answer
Energy needed to start a reaction
Energy released during a reaction
Energy required to maintain equilibrium
Energy to change temperature
Question 9 of 36
For which type of reaction does the rate depend on the product of the concentrations of two reactants?
Choose 1 answer
Zero-order
First-order
Second-order
Third-order
Question 10 of 36
In a zero-order reaction, what happens to the rate if the concentration of the reactant is doubled?
Choose 1 answer
Rate doubles
Rate triples
Rate remains the same
Rate decreases
Question 11 of 36
Which of the following is a characteristic of a catalyst?
Choose 1 answer
It is consumed in the reaction
It lowers the activation energy
It is formed in the reaction
It raises the activation energy
Question 12 of 36
In a reaction mechanism, what is the term for a reaction step that determines the overall rate of the reaction?
Choose 1 answer
Rate-determining step
Intermediate step
Catalytic step
Initiation step
Question 13 of 36
What does the term 'reaction order' indicate?
Choose 1 answer
The number of products formed
The sum of the powers of the concentrations of reactants in the rate law
The total number of molecules involved
The time required for the reaction to complete
Question 14 of 36
Which method is commonly used to determine the rate law experimentally?
Choose 1 answer
Spectroscopy
Titration
Rate of appearance/vanishing
Chromatography
Question 15 of 36
In a reaction with a rate law Rate = k[A][B]^2, what is the overall reaction order?
Choose 1 answer
1
2
3
4
Question 16 of 36
Which factor does NOT affect the activation energy of a reaction?
Choose 1 answer
Catalyst
Temperature
Concentration
Nature of reactants
Question 17 of 36
What does a reaction rate constant indicate?
Choose 1 answer
The rate of the reaction at equilibrium
The rate of reaction under standard conditions
The proportionality factor relating the reaction rate to the concentrations
The maximum rate of the reaction
Question 18 of 36
Which equation is used to calculate the rate constant from the slope of a concentration vs. time graph for a first-order reaction?
Choose 1 answer
k = -slope
k = slope
k = 1/slope
k = slope/2
Question 19 of 36
What is the effect of increasing the temperature on the rate of reaction according to the Arrhenius equation?
Choose 1 answer
Decreases the rate
Increases the rate
No effect
Decreases the activation energy
Question 20 of 36
What does the term 'reaction mechanism' refer to?
Choose 1 answer
The overall reaction
The series of elementary steps leading to the overall reaction
The rate of the reaction
The concentration of reactants
Question 21 of 36
Which of the following reactions is an example of a zero-order reaction?
Choose 1 answer
A → B
2A → B
A + B → C
A + B → 2C
Question 22 of 36
What type of plot is used to determine the order of a reaction from experimental data?
Choose 1 answer
Logarithmic plot
Linear plot
Exponential plot
Arrhenius plot
Question 23 of 36
What is the effect of a catalyst on the reaction rate?
Choose 1 answer
Increases the activation energy
Lowers the activation energy
Decreases the rate constant
Changes the equilibrium position
Question 24 of 36
Which statement about intermediates in a reaction mechanism is true?
Choose 1 answer
They are present in the overall balanced equation
They appear in the rate law
They are produced and consumed during the reaction
They affect the activation energy of the reaction
Question 25 of 36
In the context of chemical kinetics, what does 'rate' refer to?
Choose 1 answer
The speed of the reaction
The equilibrium constant
The concentration of reactants
The activation energy
Question 26 of 36
What is the relationship between the rate constant and temperature according to the Arrhenius equation?
Choose 1 answer
Directly proportional
Inversely proportional
Exponential
Logarithmic
Question 27 of 36
How does increasing the concentration of reactants affect the rate of reaction for a first-order reaction?
Choose 1 answer
Increases the rate
Decreases the rate
No effect
Increases the activation energy
Question 28 of 36
Which of the following best describes the role of an inhibitor in a chemical reaction?
Choose 1 answer
Increases the reaction rate
Decreases the reaction rate
Catalyzes the reaction
Does not affect the reaction
Question 29 of 36
In a reaction where the rate is given by Rate = k[A]^0[B]^1, what is the order of the reaction with respect to A?
Choose 1 answer
Zero-order
First-order
Second-order
Third-order
Question 30 of 36
Which plot is used to determine if a reaction is second-order?
Choose 1 answer
Concentration vs. time
1/concentration vs. time
Log(concentration) vs. time
Arrhenius plot
Question 31 of 36
What happens to the reaction rate if the temperature is increased from 298 K to 308 K?
Choose 1 answer
Rate decreases
Rate remains the same
Rate increases
Rate becomes zero
Question 32 of 36
What is the term for a reaction that occurs in a single step?
Choose 1 answer
Complex reaction
Unimolecular reaction
Elementary reaction
Multistep reaction
Question 33 of 36
Which of the following is NOT a method to measure reaction rates?
Choose 1 answer
Change in mass
Change in volume
Change in color
Change in pH
Question 34 of 36
What is the primary role of a reaction mechanism in chemical kinetics?
Choose 1 answer
To describe the final products
To provide the overall reaction stoichiometry
To explain the step-by-step process of a reaction
To calculate equilibrium constants
Question 35 of 36
Which of the following will increase the reaction rate of a reaction?
Choose 1 answer
Adding a catalyst
Decreasing the temperature
Diluting the reactants
Increasing the activation energy
Question 36 of 36
Which of the following statements about the rate of reaction is true?
Choose 1 answer
It is always constant
It depends on the concentration of reactants
It is only affected by temperature
It is independent of the concentration of reactants
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