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Anne Marie Helmenstine, Ph.D.

Updated Articles and Resources

By Anne Marie Helmenstine, Ph.D.

    Updated Articles and Resources
    • Sodium Carbonate from Baking Soda Created: Friday, May 06, 2011 Updated: Tuesday, April 22, 2014
      These are easy instructions for making sodium carbonate, also known as washing soda or soda ash, from baking soda or sodium bicarbonate." itemprop="description" Thursday, June 28, 2012 Updated: Tuesday, April 22, 2014
      The Rydberg formula is a mathematical formula used to predict the wavelength of light resulting from an electron moving between energy levels of an atom.
    • How to Make Blue Fire Created: Wednesday, February 24, 2010 Updated: Tuesday, April 22, 2014
      It's very easy to make blue fire. Here are a few of the ways you can make blue fire yourself.
    • Why Is the Ocean Salty? Created: Wednesday, February 03, 2010 Updated: Tuesday, April 22, 2014
      Have you ever wondered why the ocean is salty? Have you wondered why lakes might not be salty? Here's a look at what makes the ocean salty and why other bodies of water have a different chemical composition.
    • Meter Definition Created: Friday, September 04, 2009 Updated: Tuesday, April 22, 2014
      This is the science and engineering glossary definition of a meter.
    • What Is the Most Abundant Salt in the Sea? Created: Tuesday, April 22, 2014 Updated: Tuesday, April 22, 2014
      Find out what the most abundant salt in the sea is.
    • Chemistry Problems Created: Wednesday, June 30, 2010 Updated: Tuesday, April 22, 2014
      The best way to learn chemistry is to practice working problems, but it helps to see how each type of problem is solved. Follow examples of worked chemistry problems. These chemistry problems are a...
    • Aryl Definition Created: Friday, October 01, 2010 Updated: Tuesday, April 22, 2014
      This is the definition of aryl. Chemistry.
    • Why is Stainless Steel Stainless? Created: Saturday, January 31, 2004 Updated: Tuesday, April 22, 2014
      Explanation of Why Stainless Steel Resists Rust and Corrosion
    • Worked Chemistry Problems Created: Tuesday, July 11, 2006 Updated: Tuesday, April 22, 2014
      These are examples of worked chemistry problems. Printable worksheets with questions and answers are also provided.
    • Van der Waals Forces Definition Created: Thursday, December 18, 2008 Updated: Tuesday, April 22, 2014
      Van der Waals Forces definition, as used in chemistry, chemical engineering, and physics.
    • Concentration and Molarity Test Questions Created: Thursday, August 11, 2011 Updated: Tuesday, April 22, 2014
      Concentration is the amount of a substance in a predefined volume of space. The basic measurement of concentration in chemistry is molarity, or number of moles of solute per liter of solvent. This ...
    • Acid Anhydride Definition Created: Tuesday, June 15, 2004 Updated: Tuesday, April 22, 2014
      Acid Anhydride definition, as used in chemistry, chemical engineering, and physics.
    • How Sarin Gas Works Created: Sunday, September 08, 2013 Updated: Tuesday, April 22, 2014
      Sarin is an organophosphate nerve agent or nerve gas. Here's a look at how it works and how exposure to Sarin is treated.
    • Equation of a Line Created: Thursday, November 19, 2009 Updated: Tuesday, April 22, 2014
      There are many instances in science and math in which you will need to determine the equation of a line. Here's a quick overview and example of how to determine the equation of a line from (x,y) data.
    • Nylon Synthesis Created: Friday, January 21, 2011 Updated: Tuesday, April 22, 2014
      The reaction used to make nylon sometimes is called the nylon rope trick because nylon is produces as a single long hollow tube or rope. Here is how to make nylon or perform the nylon rope trick.
    • Pollution Science Fair Projects Created: Monday, August 31, 2009 Updated: Tuesday, April 22, 2014
      This is a collection of ideas for pollution and green chemistry science fair projects.
    • Ketchup and Baking Soda Volcano Created: Saturday, April 04, 2009 Updated: Tuesday, April 22, 2014
      The acetic acid in ketchup reacts with baking soda to produce an extra-special type of lava for a chemical volcano. This is a non-toxic volcano recipe that is sure to please!
    • Coordination Number Definition Created: Wednesday, May 04, 2011 Updated: Tuesday, April 22, 2014
      Learn the definition of the term "coordination number" with About.com's Chemistry Glossary, by Anne Marie Helmenstine, Ph.D.
    • Room Temperature Definition Created: Sunday, April 10, 2011 Updated: Tuesday, April 22, 2014
      There is no exact room temperature. It's a range.
    • Smoke Chemistry Created: Monday, November 28, 2011 Updated: Tuesday, April 22, 2014
      Smoke consists of gases and airborne particles produces as a result of combustion or burning. Here's a look at its composition.
    • Weak Acid Definition Created: Sunday, December 28, 2008 Updated: Tuesday, April 22, 2014
      Weak Acid definition, as used in chemistry, chemical engineering, and physics.
    • Paramagnetism Definition Created: Monday, August 03, 2009 Updated: Tuesday, April 22, 2014
      This is the glossary definition of paramagnetism.
    • Surface Area and Volume Formulas Created: Monday, June 16, 2008 Updated: Tuesday, April 22, 2014
      Surface area and volume formulas are part of the math used in common science calculations. You may need to calculate surface area and volume to determine density, pressure and concentration, for ex...
    • White Gold Isn't White Created: Monday, January 17, 2011 Updated: Tuesday, April 22, 2014
      Did you know all white gold is plated with another metal to make it the shiny white color that it is? Here's a look at what white gold is plated with and why it is plated in the first place.
    • How Do Safety Matches Work? Created: Tuesday, May 15, 2007 Updated: Tuesday, April 22, 2014
      Learn about how safety matches work and why they are considered 'safe'.
    • How Much Is the Nobel Prize Worth? Created: Monday, October 08, 2012 Updated: Tuesday, April 22, 2014
      The Nobel Prize comes with a diploma, medal and cash award. Here is a look at how much the Nobel Prize is worth.
    • Do Mood Rings Work? Created: Saturday, February 26, 2011 Updated: Tuesday, April 22, 2014
      Do mood rings really work? Can a mood ring tell your mood? Here's a look at how mood rings change colors and whether they can really tell your mood.
    • Kilopascal (kPa) Definition Created: Sunday, December 14, 2008 Updated: Tuesday, April 22, 2014
      Kilopascal (kPa) definition, as used in chemistry, chemical engineering, and physics.
    • What Is the IUPAC and What Does It Do? Created: Monday, May 01, 2006 Updated: Tuesday, April 22, 2014
      Find out what the IUPAC is and learn a little about about what the IUPAC does within the academic and chemistry communities.
    • Partial Pressure Definition Created: Thursday, April 07, 2011 Updated: Tuesday, April 22, 2014
      This is the definition of partial pressure.
    • Real Gas Definition Created: Sunday, April 10, 2011 Updated: Tuesday, April 22, 2014
      This is the definition of real gas.

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