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CH 222 > Reaction Mechanisms and Catalysts > Flashcards

Reaction Mechanisms and Catalysts Flashcards

1
Q

What is a reaction mechanism?

A

A series of reaction steps that make up the overall reaction

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2
Q

What are the individual steps in a reaction mechanism called?

A

Elementary steps

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3
Q

How do you find the overall equation for a reaction from the elementary steps?

A

Add the steps and cancel common species

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4
Q

What is molecularity?

A

The number of reactant molecules in an elementary step of a reaction

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5
Q

What is a unimolecular step?

A

An elementary step with 1 reactant molecule

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6
Q

What is a bimolecular step?

A

An elementary step with 2 reactant molecules

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7
Q

What is a termolecular step?

A

An elementary step with 3 reactant molecules (this is rare)

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8
Q

What is the reaction order for a unimolecular step?

A

1st order

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9
Q

What is the reaction order for a bimolecular step?

A

2nd order

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10
Q

What is the rate-determining step?

A

The slowest elementary step in a reaction

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11
Q

The rate law for the overall reaction is the same as the rate law for which elementary step?

A

The rate-determining step (the slowest one)

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12
Q

What is a reaction intermediate?

A

A substance formed in one step in a reaction mechanism and used up in the next

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13
Q

How does a catalyst increase reaction rate?

A

By lowering activation energy by providing an alternate reaction mechanism

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14
Q

How does a catalyst change the reaction mechanism?

A

It divides the reaction into two steps

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15
Q

Does a catalyst affect a reaction yield?

A

No

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16
Q

For A + B –> product, what is the molecularity and rate law?

A

Bimolecular
Rate = k[A][B]

17
Q

For 2A –> product, what is the molecularity and rate law?

A

Bimolecular
Rate = k[A]^2

18
Q

For A –> product, what is the molecularity and rate law?

A

Unimolecular
Rate = k[A]

19
Q

What types of catalysts are in the same phase as the reactants?

A

Homogenous catalysts

20
Q

What types of catalysts are in a different phase than the reactants?

A

Heterogenous catalysts

CH 222 (33 decks)

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