Kinetics Lecture 1

Question 0

What is the rate of reaction?

Answer 0

The rate at which a chemical reaction occurs

Question 1

Is kinetics related to how far a chemical reaction goes, or how fast it goes?

Answer 1

How fast it goes

Question 2

What can the rate of reaction be measured by?

Answer 2

Determining how the concentration of a reactant or product changes with time

Question 3

What is the units for rate of reaction?

Answer 3

MolL -1 s-1

Question 4

Where is the speed (velocity) found?

Answer 4

From the gradient of the graph

Question 5

What is the gradient of the graph called?

Answer 5

A rate

Question 6

How are all rate laws determined?

Answer 6

Experimentally

Question 7

What factors affect reaction rate?

Answer 7

1. Chemical nature of the reaction
2. Physical States of the reactants and products
3. Concentrations of the reactants
4. Temperature
5. Presence of catalyst or an inhibitor

Question 8

In the rate law, what are x and y?

Answer 8

The ORDERS of the reaction

Question 9

What is k in the rate law?

Answer 9

The rate constant

Question 10

What order reaction is it if x+y= 0?

Answer 10

Zero order reaction

Question 11

What order reaction is it if x+y=1?

Answer 11

A first order reaction

Question 12

What order reaction is it if x+y= 2?

Answer 12

A second order reaction

Question 13

What is the units of a zero order reaction?

Answer 13

MolL-1 s-1

Question 14

What is the units of first order reactions?

Answer 14

s-1

Question 15

What is the second order reaction unit?

Answer 15

Mol-1 Ls-1

Question 16

What does the rate law involve? Reactants or products?

Answer 16

Reactants only

Question 17

Why are some second order reactions appear as first order reactions?

Answer 17

Because one reactant (B) has a much larger concentration.

[B] will be approx constant as reaction occurs

Question 18

What does the rate law become of reactions that are second order but appear first?

Answer 18

Rate = k'[A] 
K' = k[B] (constant)

Question 19

What are the reactions called when they are second order but appear first?

Answer 19

Pseudo first order reactions

Question 20

What is the affect as [A] doubles with zero order?

Answer 20

No change

Question 21

What is the effect as [A] doubles with first order?

Answer 21

Rate doubles

Question 22

What is the effect as [A] doubles with second order?

Answer 22

Rate increases x4