Keeping Up with Focus Chemistry

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
Posted
Stoichiometry Part III: Tackling Redox Stoichiometry

Stoichiometry Part III: Tackling Redox Stoichiometry

A common type of question in A-level Chemistry Preliminary Exams is redox calculation questions. This type of question usually appears in Paper 1 (MCQ) which allows only 1.5 minutes to... Read More
Posted
Stoichiometry Part II: Tackling interesting A Level Chemistry Prelim Question: Gases

Stoichiometry Part II: Tackling interesting A Level Chemistry Prelim Question: Gases

In this section, we shall look at a few past year MCQ questions from top JCs. In the A levels Chemistry, the MCQ paper (paper 1) is a 40-question paper,... Read More
Posted
Stoichiometry Part I: Tackling standard A Level / Prelims examination questions

Stoichiometry Part I: Tackling standard A Level / Prelims examination questions

Stoichiometry and mole concept have been covered in the O levels and is redone during the first few months of Junior College (JC) Chemistry during the first year. Therefore, many... Read More
Posted