Reaction Kinetics

February 28, 2017

Reaction Kinetics Part 4: Half Life – The Application

Most A Level H2 Chemistry students have no problem determining the half life of reactants in a reaction. A good proportion, however, might have issues with half lives of products. Let’s take a look at a past year preliminary question RI, 2006 P3; DHS, 2012 P3...
February 28, 2017

Reaction Kinetics Part 4: Half Life – The Theory

The concept of half life is commonly used in A Levels H2 Chemistry syllabus. Many of us know that the half life of 1st order reaction is constant, but why is it constant? What is meant by constant? And how about other orders? What is half life (t 1/2)? It is...
February 28, 2017

Reaction Kinetics Part 3: Pseudo Order Reactions

Click here to view Reaction Kinetics Part I: The Truth behind Rate Equations II In the determination of reaction orders and rate constant, one of the common used technique is known as the method of excess. Consider a hypothetical reaction: 2A (aq) + B(aq) → 3C (aq)...
February 28, 2017

Reaction Kinetics Part 2: The Truth behind Rate Equations II

During the previous discussion on rate equations, one of the key points covered was the definition of rate in the rate equation. The term “rate” refers to instantaneous rate, rather than average rate. However, in the absence of instantaneous rate data, average rate...