User contributions for Alex

1 June 2007

• 03:4803:48, 1 June 2007 diff hist +293‎ N File:800px-Hydrogen-peroxide-3D-balls.png ‎ This is a depiction of the molecular structure of hydrogen peroxide.

22 March 2007

• 21:0721:07, 22 March 2007 diff hist +312‎ File:Sulfuric acid chemical structure .png ‎ →‎Copyright status
• 21:0621:06, 22 March 2007 diff hist +293‎ File:Sulfuric Acid.PNG ‎ →‎Copyright status
• 21:0421:04, 22 March 2007 diff hist +155‎ N File:Sulfuric Acid.PNG ‎ 3D Model of sulfuric acid

20 March 2007

• 21:0521:05, 20 March 2007 diff hist +174‎ N File:Sulfuric acid chemical structure .png ‎ Chemical structure of sulfuric acid
• 21:0321:03, 20 March 2007 diff hist +159‎ N File:Sulfurous acid.jpg ‎ Lewis structure of sulfuric acid. current

30 November 2006

• 05:5605:56, 30 November 2006 diff hist +148‎ N File:414px-Gluehbirne 2 db.jpg ‎ A lightbulb.

4 October 2006

• 21:1221:12, 4 October 2006 diff hist +335‎ N File:Nitrogen Cycle.jpg ‎ Nitrogen Cycle

3 October 2006

• 21:2321:23, 3 October 2006 diff hist +148‎ N File:799px-Liquid nitrogen dsc04496.jpg ‎ Liquid Nitrogen