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General Chemistry > chemical kinetics > Flashcards

chemical kinetics Flashcards

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1
Q

What is reaction order?

A

How much the concentration of a reactant affects the reaction rate

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2
Q

What does it mean when a reaction is zero order?

A

Concentration has no effect on rate

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3
Q

What does it mean when a reaction is first order?

A

When concentration increases by 1, rate increases by 1

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4
Q

What does it mean when a reaction is second order?

A

When concentration increases by 1, rate increases by 2

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5
Q

What is the rate law?

A

k([A]^order of A)([B]^order of B)

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6
Q

How do you find reaction order?

A

Reaction order must be determined experimentally

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7
Q

What is the integrated rate law for first order reactions?

A

ln[A]t = -kt + ln[A]0

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8
Q

What is the integrated rate law for second order reactions?

A

1/[A]t = kt + 1/[A]0

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9
Q

What is half-life?

A

Time for half of a reaction to be consumed

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10
Q

What is half life for zero order reactions?

A

[A]0/k

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11
Q

What is the half life for first order reactions?

A

0.693/k

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12
Q

What is half life for second order reactions?

A

1/k[A]0

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13
Q

How does concentration affect rate of reaction?

A

The rate of reaction increases with increasing concentration

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14
Q

How does activation energy affect rate of reaction?

A

The rate of reaction decreases when activation energy increases

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15
Q

What is activation energy (Ea)?

A

Minimum energy needed to break bonds (minimum energy to start reaction)

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16
Q

How does temperature affect rate of reaction?

A

Rate of reaction increases with temperature

17
Q

What is the arrhenius equation used for?

A

Comparing reaction constant at 2 different temperatures

18
Q

What is an elementary step?

A

One individual step in a reaction

19
Q

What is an intermediate?

A

An element that appears on both sides of a reaction

20
Q

What is the rate determining step?

A

The slowest step in a reaction

21
Q

What is molecularity?

A

The amount of molecules involved in one step on the reactant side

22
Q

What is an energy profile

A

A graph of energy vs progress of reaction

23
Q

How do you determine the number of steps a reaction has from the energy profile?

A

Count the number of peaks

24
Q

What is an elementary reaction?

A

A reaction with 1 elementary step

25
Q

How do you determine the activation energy of an elementary step from the energy profile?

A

Distance between trough and peak

26
Q

What is a trough on an energy profile?

A

Intermediate

27
Q

What does a catalyst do?

A

Speeds up reactions

General Chemistry (10 decks)

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