Mendelian genetics is the process of working out probability using punnett squares. We look at where alleles come from and what they do and how you ca...

Moles are counting numbers. Lots of chemistry happens in solutions so here we look at measuring and expressing how much substance is dissolved in a so...

How to relate emirical formula to molecluar formula and why

Analysis of compounds gives Percentage composition. So we look at percentage composition and then how to calculate the simplest ratio of elements.

The third class on quantitative chemistry. Analysing the analysis of the reaction between Magnesium and oxygen. Based on an experiment. Unpacking quan...

More on the mole and the importance of mole ratios - stoichiometry

Introduction to quantitative chemistry - the mole

More about DNA. DNA replication - the first pass as well as where DNA replication happens.

Introduction to DNA at Year 13. Structure and function.

The fourth lesson on DNA. Structure and function