USEFUL LINKS:

* Thermodynamic Software by THERMART:

http://www.thermart.net/

* Periodic Table:

http://www.ptable.com/

* Calculations of volumes,areas and circumference:

http://www.aquatext.com/calcs/calculat.htm

http://www.easycalculation.com/area/maths.php

* Balancing Chemical Equations:

http://www.webqc.org/balance.php