TOPIC 6: REACTION KINETICS

Question 1

[Definition] Rate of reaction

Answer 1

It is defined as the change in concentration of a reactant or product per unit time

Question 2

[Definition] Rate equation

Answer 2

It is an experimentally determined mathematical equation between the reaction rate and the concentration of the reactants at a particular temperature

**May not include all reactants in the chemical equation

Question 3

[Definition] Order of reaction

Answer 3

It is the power to which the concentration of the reactant is raised to in an experimentally determined rate equation

Question 4

[Definition] Rate constant

Answer 4

It is a proportionality constant for a given reaction at a specified temperature

**Only affected by temperature & catalyst

Question 5

[Definition] Half-life

Answer 5

The half-life of a reaction is the time taken for the concentration of a reactant to be decreased to half its initial value

Question 6

[Definition] Rate determining step

Answer 6

It is the slowest step in a sequence of elementary reactions

Question 7

[Definition] Activation energy

Answer 7

It is the minimum amount of energy that the reactant particles must have to collide effectively to form products

Question 8

[Definition] Catalyst

Answer 8

A catalyst is a substance that increases the rate of reaction of a reaction by providing an alternative reaction pathway of lower activation energy and remains chemically unchanged at the end of the reaction

Question 9

[Definition] Catalysis

Answer 9

A process in which the substance increases the rate of a chemical reaction without itself undergoing and permanent chemical change

Question 10

[Definition] Autocatalysis

Answer 10

A process in which a product of a chemical reaction increases the rate of that reaction