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What does the units of the rate constant for a first order reaction denote?

Concentration$^{-1}$·Time$^{-1}$

Time$^{-1}$ (correct)

Mole$^{-1}$·Time$^{-1}$

Energy$^{-1}$·Time$^{-1}$

Which of the following statements about a catalyst is accurate?

A catalyst decreases the activation energy. (correct)

A catalyst forms an activated complex of higher potential energy.

A catalyst always lowers the reaction rate.

A catalyst changes the equilibrium constant of the reaction.

In a zero order reaction, which statement is true?

The concentration of reactant remains constant. (correct)

The reaction rate depends on the concentration of reactants.

The reaction cannot occur without a catalyst.

The rate constant has units of concentration.

What characterizes the order of reactions?

The order expresses the relationship between concentration and reaction rate. Signup and view all the answers

Which of the following statements about the rate of a first-order reaction is accurate?

The rate is constant over time. Signup and view all the answers

Which assertion is true concerning the activated complex formed by a catalyst?

It accelerates the reaction via a new pathway. Signup and view all the answers

Which statement about the reactions with fractional order is correct?

Fractional order always indicates a complex mechanism. Signup and view all the answers

What condition is necessary for successful collisions to lead to a reaction?

Proper orientation and sufficient energy Signup and view all the answers

Which statement is correct regarding the behavior of molecular collisions in a reaction?

Most collisions do not lead to a reaction. Signup and view all the answers

What is the relationship between the reactants in a second-order reaction?

It involves at least two reactants. Signup and view all the answers

For the reaction N2 (g) + 3H2 (g) ⇌ 2 NH3 (g), which option represents the correct rate relationship?

3 d[H2]/dt = 2 d[NH3]/dt Signup and view all the answers

What is the appropriate expression for the concentration of a pseudo unimolecular reaction?

[A] = [A]0 e^(-kt) Signup and view all the answers

In the context of a first-order reaction, what does a specific rate of 10 s^-1 indicate?

The concentration of products changes slowly. Signup and view all the answers

Which statement is true regarding catalysts?

They alter the rate of reaction but are not consumed. Signup and view all the answers

In reaction kinetics, how is molecularity defined?

It refers to the number of molecules participating in an elementary reaction. Signup and view all the answers

Which of the following statements regarding reaction orientation is incorrect?

Proper orientation always guarantees a reaction will occur. Signup and view all the answers

What does the expression for a first-order reaction typically look like?

[A] = [A]0 e^(-kt) Signup and view all the answers

Which statement correctly describes molecularity and its influence on reaction rate?

Molecularity does not influence the rate of reaction. Signup and view all the answers

What must be true for a reaction to proceed with a catalyst?

A catalyst must be present at the collision. Signup and view all the answers

Which statement about the slowest step in a reaction scheme is correct?

The overall kinetics are governed by the slowest step. Signup and view all the answers

Which of the following best describes the relationship between order and molecularity for a complex reaction?

Order is determined experimentally while molecularity is theoretical. Signup and view all the answers

Which of the following statements about reaction kinetics is incorrect?

Zero-order reactions depend on concentration. Signup and view all the answers

Which of the following best defines a zero order reaction?

Rate is constant regardless of reactant concentration. Signup and view all the answers

Which statement is true regarding the relationship between kinetic energy and reaction progress?

Total kinetic energy decreases with the progress of the reaction. Signup and view all the answers

Which of the following represents a correct matching between order of reaction and its corresponding expression for a zero order reaction?

t1/2 ∝ [A] 0 Signup and view all the answers

How much time will it take for 20 g of the reactant to reduce to 5 g?

346.5 s Signup and view all the answers

What does the rate of a zero order reaction depend on?

Rate constant Signup and view all the answers

Which of the following reactions is considered a first order reaction?

C2 H4 + H2 → C2 H6 Signup and view all the answers

What is the order of reaction for C12 H22 O11 + H2 O → C6 H12 O6?

Pseudo first order Signup and view all the answers

Which matched pair correctly identifies the mathematical expression for the rate of reaction?

a-III, b-I, c-II, d-IV Signup and view all the answers

In a second order reaction, the rate constant has what units?

M^2/s Signup and view all the answers

What is the order of reaction for the following reaction: CH3 COOC2 H5 → CH3 COOH + C2 H5 OH?

First order Signup and view all the answers

For which expression does the rate of reaction change depending on both the reactants involved?

Second order Signup and view all the answers

What represents the overall reaction rate in systems with multiple steps?

Slowest step determines the rate Signup and view all the answers

Which order of reaction is characterized by a constant rate that does not change with concentration?

Zero order Signup and view all the answers

What will be the order of the reaction with respect to M if its disappearance increases by a factor of 8 when its concentration is doubled?

3 Signup and view all the answers

If the temperature coefficient of a reaction is 2, how many times will the rate of reaction increase when the temperature is raised from 30°C to 90°C?

Which of the following expressions correctly represents the rate for the reaction involving A and D2?

k[D2][A] Signup and view all the answers

Given the reaction 2SO2 + O2 ⇌ 2SO3, what is the rate of appearance of SO3 if the rate of disappearance of O2 is 2 × 10^-4 mol L-1 s-1?

4 × 10^-4 mol L-1 s-1 Signup and view all the answers

What does an increase in temperature do to the rate of a chemical reaction?

Generally increases the rate due to increased collision frequency Signup and view all the answers

Which assertion about reaction rates and temperature is true?

Both assertions are true and the reason explains the assertion. Signup and view all the answers

What can be said about reactions of higher order?

They are generally rare in comparison to lower order reactions. Signup and view all the answers

When the concentration of a reactant is doubled and the rate increases by a factor of 8, which of the following is likely true about the reaction order?

The reaction is third order with respect to that reactant. Signup and view all the answers

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Questions and Answers

What does the units of the rate constant for a first order reaction denote?

Which of the following statements about a catalyst is accurate?

In a zero order reaction, which statement is true?

What characterizes the order of reactions?

Which of the following statements about the rate of a first-order reaction is accurate?

Which assertion is true concerning the activated complex formed by a catalyst?

Which statement about the reactions with fractional order is correct?

What condition is necessary for successful collisions to lead to a reaction?

Which statement is correct regarding the behavior of molecular collisions in a reaction?

What is the relationship between the reactants in a second-order reaction?

For the reaction N2 (g) + 3H2 (g) ⇌ 2 NH3 (g), which option represents the correct rate relationship?

What is the appropriate expression for the concentration of a pseudo unimolecular reaction?

In the context of a first-order reaction, what does a specific rate of 10 s^-1 indicate?

Which statement is true regarding catalysts?

In reaction kinetics, how is molecularity defined?

Which of the following statements regarding reaction orientation is incorrect?

What does the expression for a first-order reaction typically look like?

Which statement correctly describes molecularity and its influence on reaction rate?

What must be true for a reaction to proceed with a catalyst?

Which statement about the slowest step in a reaction scheme is correct?

Which of the following best describes the relationship between order and molecularity for a complex reaction?

Which of the following statements about reaction kinetics is incorrect?

Which of the following best defines a zero order reaction?

Which statement is true regarding the relationship between kinetic energy and reaction progress?

Which of the following represents a correct matching between order of reaction and its corresponding expression for a zero order reaction?

How much time will it take for 20 g of the reactant to reduce to 5 g?

What does the rate of a zero order reaction depend on?

Which of the following reactions is considered a first order reaction?

What is the order of reaction for C12 H22 O11 + H2 O → C6 H12 O6?

Which matched pair correctly identifies the mathematical expression for the rate of reaction?

In a second order reaction, the rate constant has what units?

What is the order of reaction for the following reaction: CH3 COOC2 H5 → CH3 COOH + C2 H5 OH?

For which expression does the rate of reaction change depending on both the reactants involved?

What represents the overall reaction rate in systems with multiple steps?

Which order of reaction is characterized by a constant rate that does not change with concentration?

What will be the order of the reaction with respect to M if its disappearance increases by a factor of 8 when its concentration is doubled?

If the temperature coefficient of a reaction is 2, how many times will the rate of reaction increase when the temperature is raised from 30°C to 90°C?

Which of the following expressions correctly represents the rate for the reaction involving A and D2?

Given the reaction 2SO2 + O2 ⇌ 2SO3, what is the rate of appearance of SO3 if the rate of disappearance of O2 is 2 × 10^-4 mol L-1 s-1?

What does an increase in temperature do to the rate of a chemical reaction?

Which assertion about reaction rates and temperature is true?

What can be said about reactions of higher order?

When the concentration of a reactant is doubled and the rate increases by a factor of 8, which of the following is likely true about the reaction order?

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