Atoms
http://ed.ted.com/lessons/just-how-small-is-an-atom Size of an Atom
https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html Building Atoms
http://phet.colorado.edu/en/simulation/states-of-matter-basics States of Matter and Changes
http://phet.colorado.edu/en/simulation/density Density
https://www.youtube.com/watch?v=yA3TZJ2em6g Balancing Chemical Equations
https://www.youtube.com/watch?v=NddZ5ftQb0Q Acids and Bases ( Cheeseburger video)
https://www.youtube.com/watch?v=WnPrtYUKke8 Acids and Bases ( Soda can video)
http://static.lawrencehallofscience.org/scienceview/scienceview.berkeley.edu/html/showcase/flash/juicebar.html Acids and Bases
http://ed.ted.com/lessons/just-how-small-is-an-atom Size of an Atom
https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html Building Atoms
http://phet.colorado.edu/en/simulation/states-of-matter-basics States of Matter and Changes
http://phet.colorado.edu/en/simulation/density Density
https://www.youtube.com/watch?v=yA3TZJ2em6g Balancing Chemical Equations
https://www.youtube.com/watch?v=NddZ5ftQb0Q Acids and Bases ( Cheeseburger video)
https://www.youtube.com/watch?v=WnPrtYUKke8 Acids and Bases ( Soda can video)
http://static.lawrencehallofscience.org/scienceview/scienceview.berkeley.edu/html/showcase/flash/juicebar.html Acids and Bases
Electromagnetism
http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/living_future/5_magnetic_fieldact.shtml
Magnets and Earth's Magnetic Field
https://www.youtube.com/watch?v=h5oXWtSMHzw 10 Cool Tricks with magnets
Gravity
http://phet.colorado.edu/en/simulation/legacy/gravity-and-orbits Gravity Simulator
http://www.exploratorium.edu/ronh/weight/ Your weight on other planets
http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/living_future/5_magnetic_fieldact.shtml
Magnets and Earth's Magnetic Field
https://www.youtube.com/watch?v=h5oXWtSMHzw 10 Cool Tricks with magnets
Gravity
http://phet.colorado.edu/en/simulation/legacy/gravity-and-orbits Gravity Simulator
http://www.exploratorium.edu/ronh/weight/ Your weight on other planets