#03 Science in History 8th May 1980 In 1967, The World Health Organization (WHO) launched widespread surveillance, immunisation and...

#02 Science in History 7th May 1992 On this day, the last Space Shuttle to be built was launched from Kennedy Space Center. Its mission...

#01 Science in History 5th May 1925 In Tennessee, USA, football coach and sometime substitute teacher John T. Scopes is arrested for...

How Many Significant Figures? A question that caused all sorts of problems for me in my younger days. It seems that others have similar...

Circle Theorem Revision

For the following, let AB represent a compound * ‘The energy change when…’ Lattice Enthalpy *… 1 mole of an ionic compound is formed from...

The formula ​y​ = ​mx​ + ​c​ represents a linear equation that plots a straight line on a graph. The y and x represent the axes, m the...

An overview of three theories used to describe acids and bases. Arrhenius Theory Arrhenius Acids - produce H+ ions in water H+(aq)...

Atomic Radii Given that atoms and ions are subject to different environments and forces, it is difficult to assign atomic/ionic radii -...

A guide to the two pathways for nucleophilic substitution. SN1 Mechanism The mechanism involves two-steps. With a tertiary halide: In the...