Keeping Up with Focus Chemistry

Chemistry of Aqueous Solutions – Acids and Bases Part II

Chemistry of Aqueous Solutions – Acids and Bases Part II

Buffers: what exactly are they? We are taught, in A Level Chemistry, that a buffer solution minimizes pH change when small amounts of acids and bases are added. We are... Read More
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Reaction Kinetics Part 5: Half Life – The Application

Reaction Kinetics Part 5: 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... Read More
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Reaction Kinetics Part 4: Half Life – The Theory

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?... Read More
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Stoichiometry IV : A levels H2 Chemistry 2008 Paper 1 Q2: Lord Rayleigh and his “Atmospheric Nitrogen”.

Stoichiometry IV : A levels H2 Chemistry 2008 Paper 1 Q2: Lord Rayleigh and his “Atmospheric Nitrogen”.

  Recall from the calculation of relative atomic mass of chlorine : For a mixture of of 35Cl and 37Cl  isotopes in an abundance ratio of 3:1, RAM of Cl =  (3(35)+1(35))/(3+1)... Read More
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Reaction Kinetics Part 3: Pseudo Order Reactions

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... Read More
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Energetics and Thermodynamics Part II: How to Handle Unusual Questions?

Energetics and Thermodynamics Part II: How to Handle Unusual Questions?

  Most of the question came out in the preliminary examinations or the A levels H2 Chemistry examinations usually involve standard definitions that most students are familiar with… such as... Read More
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Reaction Kinetics Part 2: The Truth behind Rate Equations II

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... Read More
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Reaction Kinetics Part I: The Truth behind Rate Equations

Reaction Kinetics Part I: The Truth behind Rate Equations

  Many A Level students profess that they have not much problems with this chapter, as they can handle standard questions reasonably well. However, when one probes deeper into details,... Read More
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Mystery of Prussian and Turnbull’s Blue Revealed (Part 2)

Mystery of Prussian and Turnbull’s Blue Revealed (Part 2)

  Crystal Structure In Part 1 of the Prussian blue discussion, we noted that Prussian Blue (PB) : FeIII[FeII(CN)6] – (also known as ferric ferrocynanide)Turnbull’s Blue (TB) : FeII[FeIII(CN)6] – (also known as ferrous... Read More
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