For a first order reaction A → P , the temperature T dependent rate constant k was found to follow the equation logk =- 2000 1 T + 6 .0 . The pre-exponential factor A and the activation energy E a , respectively, are

1.0 × 10 6 s - 1 and 38.3 kJ mol - 1

1.0 × 10 6 s - 1 and 9.2 kJ mol - 1

1.0 × 10 6 s - 1 and 16.6 kJ mol - 1

Which of these does not influence the rate of reaction

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

When initial concentration of the reactant is doubled, what happens to the half-life period of a zero order reaction?

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

The decomposition of phosphine

(P H_{3})

on tungsten at low pressure is a first-order reaction. It is because the

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

Name the factors that affect the rate of a reaction. Explain in detail.

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

What is the order with respect to [A], [B] and [C], respectively?

[A]	[B]	[C]	Rate $[M / \sec]$
$0.2$	$0.1$	$0.02$	$8.08 \times 10^{- 3}$
$0.1$	$0.2$	$0.02$	$2.01 \times 10^{- 3}$
$0.1$	$1.8$	$0.18$	$6.03 \times 10^{- 3}$
$0.2$	$0.1$	$0.08$	$6.464 \times 10^{- 2}$

HARD

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

On which of the following parameters does the rate constant of a reaction depend?
(i) time, (ii) concentration of reactants, (iii) temperature, and (iv) catalyst

HARD

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

For the reaction

2 N_{2} O_{5} \overset{}{\to} 4 {NO}_{2} + O_{2}

, rate and rate constant are

1.02 \times 10^{- 4} mol {lit}^{- 1} \sec^{- 1}

and

3.4 \times 10^{- 5} \sec^{- 1}

respectively then concentration of

N_{2} O_{5}

at that time will be

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

Zinc piece and zinc powder are taken in two test tubes and equal amount of dil.

HCl

is added.
(a) In which test tube does the reaction proceed faster?
(b) Give reason.
(c) Give an instance in daily life, where such condition is made use.

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

Slope of the straight line obtained by plotting

{log}_{10} k

against

\frac{1}{T}

represents which term?

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is doubled?

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

In mechanism of any reaction, the step going in the slowest manner is called _____

HARD

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

For a first order reaction

A \to P,

the temperature

(T)

dependent rate constant

(k)

was found to follow the equation

logk =- (2000) \frac{1}{T} + 6 .0 .

The pre-exponential factor A and the activation energy

E_{a},

respectively, are

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

Which one of the factors does not affect rate of the reaction?

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

The half-life period of a first-order chemical reaction is

6.93

minutes. The time required for the completion of

99 %

of the chemical reaction will be

(\log 2 = 0 .301)

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

What is the correct difference between first and second order reactions?

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

The half-life of the first-order reaction,

{CH}_{3} CHO (g) \to {CH}_{4} (g) + CO (g)

, if the initial pressure of

{CH}_{3} CHO (g)

is

80 mm

Hg

and the total pressure at the end of

20

minutes is

120 mm

Hg

, is:

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

The following results were obtained during kinetic studies of the reaction.

2 A + B \to

product

Experiment	$[A]$ $(in mol L^{- 1})$	$[B]$ $(i n m o l L^{- 1})$	Initial rate of reaction $(in mol L^{- 1} \min^{- 1})$
$I$	$0.10$	$0.20$	$6.93 \times 10^{- 3}$
$II$	$0.10$	$0.25$	$6.93 \times 10^{- 3}$
$III$	$0.20$	$0.30$	$1.386 \times 10^{- 2}$

The time (in minutes) required to consume half of

A

is

HARD

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

N_{2} O_{5}

decomposes to

{NO}_{2}

and

O_{2}

follows the first order kinetics. After

50

minutes, the pressure inside the vessel increases from

50 mm Hg

to

87.5 mm Hg

. The pressure of the gaseous mixture after

100

minutes at constant temperature will be:

EASY

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

How will the rate of reaction be affected when surface area of the reactant is reduced?

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

The rate of a gaseous reaction is given by the expression

k [A] [B]^{2} .

If the volume of vessel is reduced to one half of the initial volume, the reaction rate as compared to original rate is

MEDIUM

Physical Sciences>Matter and Its Interactions>Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.>Chemical Reactions - Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy.

1 L

of

2 M {CH}_{3} COOH

is mixed with

1 L

of

3 M C_{2} H_{5} OH

to form an ester. The rate of the reaction with respect to the initial rate when each solution is diluted with an equal volume of water will be

Which of these does not influence the rate of reaction?

Important Questions on Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.

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