I've decided to include some english web pages which I'm used to working with.

Chemtopics: http://www.chemtopics.com/lectures.htm

Freescience: http://www.freescience.info/Chemistry.php

General Chemistry for students: http://www.chem1.com/chemed/genchem.shtml

AICOLE: http://www.educa2.madrid.org/web/aicole/secundaria

BBC Teaching Resources: http://www.teachingenglish.org.uk/teaching-resources

Physics and Chemistry resources PhET Interactive Simulations

Chemistry Resources: Chemistry Experiment Simulations, The Periodic Table of videos, IUPAC Nomenclature Books Series, IUPAC Nomenclature, IUPAC Nomenclature of Organic Chemistry, IUPAC, Sciencegeek.net

Physics Resources: Applets Walter Fendt, flash David Harrison, http://galileoandeinstein.physics.virginia.edu/, http://galileoandeinstein.physics.virginia.edu/more_stuff/flashlets/home.htm

Ramiro de Maeztu High School: http://physicsatramirohighschool.wikispaces.com/home

HyperPhysics: The best Physics website i have never seen. Link

Imagen tomada de http://fisicayquimicaparatodos.blogspot.com.es/