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Kinetics > Lecture 4: Reaction Rates and Temperature > Flashcards

Lecture 4: Reaction Rates and Temperature Flashcards

Arrhenius equation; finding Ea and A know the units of R, T, A, k, Ea Collision theory Moelcularity Unimolecular elementary reaction Bimolecular elementary reaction Termolecular elementary reaction elementary reaction Transition state factors affecting transition state reaction mechanism

1
Q

state Arrheinius equation

A

k = Ae^-Ea/RT

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2
Q

what is k in Arrhenius equation (AE)?

A

rate proportionality constant (rate constant)

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3
Q

A ?

A

pre exponential factor

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4
Q

T ?

A

temperature in Kelvin (therefore add 273.15 to Tc)

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5
Q

Ea?

A

activation energy

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6
Q

R ?

A

gas constant R= 8.31451…

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7
Q

units of A ?

A

mol L-1 s-1

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8
Q

units of T ?

A

Kelvin (K)

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9
Q

units of R ?

A

J-1 K-1 mol -1

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10
Q

Ea ?

A

J-1 mol -1

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11
Q

What does the collision theory of chemical reactions state?

A

it assumes that molecules react by the making and breaking of bonds, to do so it must collide with SUFFICIENT ENERGY and in the correct orientation

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12
Q

What is an elementary reaction?

A

the step where molecules collide

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13
Q

What gives the order of an elementary reaction?

A

the molecularity of the reaction

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14
Q

What is an elementary reaction equal to?

A

the order for each reactant is equal to its moelcularity

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15
Q

Define molecularity?

A

the number of COLLIDING entities that are INVOLVED in a single reaction step

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16
Q

What are the types of elementary reaction?

A

unimolecular
bimolecular
termolecular

17
Q

What does it mean by unimolecular elementary reaction?

A

where a SINGLE molecule REACTS with ITSELF

18
Q

What does it mean by bimolecular elementary reaction?

A

where TWO moleules meet and collide

19
Q

What does it mean by termolecular elementary reaction?

A

where 3 molecules meet and collide

20
Q

What is the RATE of an elementary reaction dependent on?

A

the rate of collisions

21
Q

What factors increase the rate of collision?

A 
temperature
concentration of reactants
physical state of reactants
presence of catalyst
presence of light
nature of reactants
22
Q

What is a reaction mechanism?

A

a series of elementary reactions leading to overall reaction

23
Q

What is the transition state?

A

in an elementary reaction, it is the point of highest energy between reactants and products

24
Q

What does it mean by reactive inermediates?

A

are short lived reactive species that appear in one step and react in a later step in the reaction mechanism

Kinetics (6 decks)

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