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Discovery of Chromium  In 1797, Louis-Nicholas Vauquelin discovered Chromium while experimenting with Siberian red lead.  He mixed crocoite with hydrochloric.

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Presentation on theme: "Discovery of Chromium  In 1797, Louis-Nicholas Vauquelin discovered Chromium while experimenting with Siberian red lead.  He mixed crocoite with hydrochloric."— Presentation transcript:

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2 Discovery of Chromium  In 1797, Louis-Nicholas Vauquelin discovered Chromium while experimenting with Siberian red lead.  He mixed crocoite with hydrochloric acid (HCl) to yield chromium oxide (CrO3).  In 1798, he was surprised to obtain metallic chromium by heating chromium oxide in a charcoal oven because he believed that a method to isolate chromium didn’t exist yet.  Today, one can yield chromium by heating the mineral chromite (FeCr2O4) in the presence of silicon or aluminum.

3 Discovery of Chromium (cont) += Chromite Heated in oven Chromium (with aluminum or silicon)

4 Characteristics of Chromium SSteel-gray color LLustrous HHard metal HHigh Melting Point (1907 °C) HHigh Boiling Point (2671 °C ) OOdorless TTasteless SSomewhat Malleable Hmmm… Chromium has no taste or smell.

5 Sources of Chromium  Formed from the ore “Chromite”  Found in Zimbabwe, Russia, New Zealand, Turkey, Iran, Albania, Finland, Democratic Republic of Madagascar, and the Phillippines.

6 Sources of Chromium (cont) = places Chromite can be found

7 Uses of Chromium Chromium is used to:  Harden Steel  Manufacture Stainless Steel  Form Many Useful Alloys  Produce a Hard, Beautiful Surface  Prevent Corrosion  Gives Glass an Emerald Green Color  Used as a Catalyst.  (the refractory industries use Chromite for forming bricks)

8 Bohr-Rutherford Diagram Yep! That’s our model!

9 Bibliography 1. Wikipedia, The Free Encyclopedia. Accessed 01/09/07. http://en.wikipedia.org/wiki/Chromium 2.Web Elements. Accessed 01/12/07. http ://www.webelements.com/webelements/scholar/elements/chro mium/history.html http ://www.webelements.com/webelements/scholar/elements/chro mium/history.html 3.Jefferson Lab. Accessed 01/12/07. http://education.jlab.org/itselemental/ele024.html

10 Many thanks to Elton John for providing me with his song “El Dorado.”


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