Updated Articles and Resources

By Anne Marie Helmenstine, Ph.D., About.com Guide since 2001

10 Polonium Facts Created: Tuesday, December 05, 2006 Updated: Tuesday, May 29, 2012
Learn some interesting facts about the element polonium.
Chemistry Encyclopedia - Topics Starting with the Letter B Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter B.
Element Discovery Timeline - When Were the Elements Discovered? Created: Sunday, October 18, 2009 Updated: Tuesday, May 29, 2012
This is a timeline showing when each of the elements was discovered.
Chemistry Encyclopedia - Topics Starting with the Letter G Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter G.
Organic Compounds - Organic Compound Names and Formulas Starting with O Created: Wednesday, April 21, 2010 Updated: Tuesday, May 29, 2012
This is a list of organic compound names and formulas with names starting with the letter O.
Chemical Structures - Structures Starting with the Letter O Created: Wednesday, July 25, 2007 Updated: Tuesday, May 29, 2012
See chemical and molecular structures. These are structures having names starting with the letter O.
Olympicene Chemical Structure Created: Tuesday, May 29, 2012 Updated: Tuesday, May 29, 2012
This is the chemical structure for olympicene.
Chemical Structures Starting with the Letter O Created: Thursday, October 11, 2007 Updated: Tuesday, May 29, 2012
Browse structures of molecules and ions that have names beginning with the letter O.
1-Octene Chemical Structure Created: Monday, October 18, 2010 Updated: Tuesday, May 29, 2012
This is the ball and stick model of the chemical structure of 1-octene.
Types of Solids - 6 Types of Solids Created: Tuesday, May 29, 2012 Updated: Tuesday, May 29, 2012
There are 6 main types of solids, each characterized by specific properties and structures. Here is a look at the main types of solids.
Solid Definition - Chemistry Glossary Definition of Solid Created: Monday, May 26, 2008 Updated: Tuesday, May 29, 2012
Soliddefinition, as used in chemistry, chemical engineering, and physics.
Chemistry Encyclopedia - Topics Starting with the Letter D Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter D.
Chemistry Encyclopedia - Topics Starting with the Letter S Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter S.
Glenn Theodore Seaborg (1912 - 1999) Created: Monday, May 05, 2008 Updated: Tuesday, May 29, 2012
Glenn Seaborg is known for his work with transuranic elements.
Chemistry Encyclopedia - Topics Starting with the Letter R Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter R.
Chemistry Encyclopedia - Topics Starting with the Letter E Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter E.
Chemistry Encyclopedia - Topics Starting with the Letter C Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter C.
Ytterbium Definition - Chemistry Glossary Definition of Ytterbium Created: Friday, May 30, 2008 Updated: Tuesday, May 29, 2012
Ytterbium definition, as used in chemistry, chemical engineering, and physics.
Chemistry Encyclopedia - Topics Starting with the Letter Y Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter Y.
Chemistry Encyclopedia - Topics Starting with the Letter U Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter U.
Uranate - Molecules with Strange Names Created: Saturday, November 22, 2003 Updated: Tuesday, May 29, 2012
Uranate - Molecules with Strange Names
Chemistry Encyclopedia - Topics Starting with the Letter P Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter P.
Chemistry Encyclopedia - Topics Starting with the Letter N Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter N.
Chemistry Encyclopedia - Topics Starting with the Letter M Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter M.
Chemistry Encyclopedia - Topics Starting with the Letter L Created: Thursday, April 19, 2007 Updated: Tuesday, May 29, 2012
Use this online chemistry encyclopedia to look up chemistry concepts beginning with the letter L.
Enthalpy Worked Chemistry Problems - Determine the Enthalpy Change of a Reaction Created: Saturday, August 08, 2009 Updated: Tuesday, May 29, 2012
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.
Heat of Formation Worked Problem - Example Problem for Heat of Formation Created: Thursday, October 08, 2009 Updated: Tuesday, May 29, 2012
These are worked example problems calculating the heat of formation.
Bond Energies and Enthalpy Change Example Chemistry Problem - Determining the Change in Enthalpy of a Reaction Created: Friday, January 23, 2009 Updated: Tuesday, May 29, 2012
Bond energies and enthalpy can be used to determine if a reaction is endothermic or exothermic. Here is an example showing how to determine the change in enthalpy of a reaction.
Calorimetry & Heat Flow - Worked Chemistry Problems Created: Wednesday, October 22, 2003 Updated: Tuesday, May 29, 2012
Calorimetry & Heat Flow - Worked Chemistry Problems
Enthalpy Worked Chemistry Problems - Determine the Enthalpy Change of a Reaction Created: Saturday, August 08, 2009 Updated: Tuesday, May 29, 2012
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction with a given amount of reactant.
Enthalpy Worked Chemistry Problems - Enthalpy Change of Water Created: Saturday, August 08, 2009 Updated: Tuesday, May 29, 2012
Worked Example Chemistry Problems - Determining change in enthalpy of melting ice and vaporizing water. Additional worked problem to determine mass of ice melted from given energy value.
Virtual Chemistry Text - Thermochemistry Created: Thursday, November 30, 2006 Updated: Tuesday, May 29, 2012
Virtual Chemistry Text: Chemistry is the study of both matter and energy. Once you learn to balance the atoms and charge in a chemical reaction, you can examine the energy of the reaction as well.

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