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Chemistry > Chemical Kinetics > Flashcards

Chemical Kinetics Flashcards

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1
Q

Unit of rate of reaction.

A

Mol per litre per second

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2
Q

What do you know about the rate constant k ( specific reaction rate ) ?

A

Rate constant l depends on temperature and is independent of the concentration of the reactants. At fixed temperature k is constant.

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3
Q

What is molecularly of a reaction ?

A

Molecularity is a whole number (not zero) and a never a fraction. It’s value does not exceed 3 and has no meaning for a complex reaction.

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4
Q

Define order of a reaction ?

A

The order of a reaction is determined through experiments. Order of a reaction can be a fraction or an integer. In a multi step reaction order is qual to the order of slowest step called rds.

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5
Q

How is order of an elementary reaction found out ?

A

In an elementary reaction the order is equal to the stochiometric coefficients of the reactants.

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6
Q

What is the unit of a zero order reaction ?

A

Mole per litre per second.

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7
Q

What is the unit of a first order reaction. ?

A

Per second.

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8
Q

What is the unit of a second order reaction ?

A

Litre per mole per second.

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9
Q

What is the half life of a zero order reaction?

A

[R]0/2k

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10
Q

What is the half life of a first order reaction?

A

0.693/k

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11
Q

What is the half life of a second Order reaction?

A

1/k[R]0

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12
Q

What is the straight line plot for a zero order reaction ?

A

[R]0 vs t

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13
Q

What is the straight line plot for a first order reaction?

A

ln[R] vs t

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14
Q

What is the straight line plot for a second order reaction ?

A

1/[R] vs t

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15
Q

For a first order reaction , what is t(75%) or t(3/4)?

A

2 t1/2

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16
Q

For a first order reaction , what is t(87.5%)?

A

3 t1/2

17
Q

For a first order reaction, what is t(99.99%)?

A

10 t1/2

18
Q

What happens to rate constant k when temperature for a general chemical reaction is increased by 10 degree celcius ?

A

Rate constant k is doubled

19
Q

What is Arrhenius Equation?

A

K= Ae^ -Ea/RT

Ea- Activation energy.

20
Q

What are the factors affecting reaction rates ?

A

Concentration of reactants and reaction temperature. Besides these, presence of catalyst and surface area for a solid reactant.

21
Q

Half life of a zero order reaction t1/2=?

A

t1/2= [A]o/2k

22
Q

Simplified Arrhenius Eq log k2/k1=?

A

log k2/k1 = -Ea/2.303R (1/T2 - 1/T1)

23
Q

For first order reaction , rate constant k=?

A

k= 2.303/t log a/a-x

Chemistry (20 decks)

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