today I filled in the gaps that I didnt know before about electrostatic repulsion and what atomic numbers are responsible for in the basics of OCR A-level chemistry. :)

today I added the basic formulas covered in the aqa specification of pure a level maths :)

added new chem cards on atomic mass and fixed up some from yesterday which were accidentally in a folder for the theory part of driving

reviewed cards on previous geography and added some new ones on Ar.

modelling- why do mathematicians simplify their models and what needs to be taken into account in models (specifically conditions)