Tutorial on how to create and use formulas, including a step by step example of a basic Excel formula. http://spreadsheets.about.com/od/excelformulas/ss/formula_begin.htm
How to make graphs using Excel
http://www.ncsu.edu/labwrite/res/gt/graphtut-home.html#cti
Topic 2 - Atomic Structure
Electron configuration of the elements (click on any element to look at its electron configuration) http://www.dorjegurung.com/chemistry/IB_year1/ElectronConfigurations.dcr
Energy levels for different orbitals in a one-electron and multi-electron species.
http://www.dorjegurung.com/chemistry/IB_year1/EnergyOrbitalsElectron.swf
Basic Chemistry Notes
Topic 4 - Bonding
http://undergrad-ed.chemistry.ohio-state.edu/jmol-viewer/#