Stock Naming System in Chemistry

The stock naming system uses roman numerals to indicate the oxidation state of metal ions in ionic compounds.  It is used because many metals have more than one possible oxidation state (charge).  One example of this is tin.  The two most common oxidation states of tin are 2+ and 4+; a Roman numeral is used in the name of the compound to tell us which oxidation state is present in a given compound of tin.


In the past it was also common to see names of compounds using their Latin names.  Some examples include ferrum for iron and aurum for gold.  In the Latin naming system, different suffixes are used to indicate the oxidation state of the metal ion.

I hope this is helpful!

Comments

Post a Comment

Popular posts from this blog

Radioactive Dinner Plate

Image
This video shows two plates being measured for emission of radiation. The orange Fiesta plate was made using a glaze which contains uranium oxide. Fiesta dinnerware was produced by the Homer Laughlin China Company of West Virginia. Prior to World War II the glazes used natural uranium.  This practice stopped during the war when the US government seized the company's stock of uranium for the Manhattan Project.  In the late 1950's the Atomic Energy Commission relaxed restrictions on uranium and production practices switched to using depleted uranium to produce the red-orange glaze. The US Environmental Protection Agency recommends that dinnerware produced with uranium glaze should not be used for food, drink or food storage.
Read more

The Effect of Concentration on the Rate of a Chemical Reaction

Image
This video shows a classic lab examining the effect of concentration of reactants on the rate of a chemical reaction.  This video supports NGSS HS-PS1-5 . In this experiment solutions of sodium thiosulfate and hydrochloric acid are combined in a beaker.  The reaction produces a precipitate which eventually makes the liquid turn cloudy.  The reaction beaker is placed over a piece of paper with a letter "X" printed on it.  The reaction is said to have gone to completion when the "X" can no longer be seen through the liquid in the beaker. I have used this video as a warm up or as a flipped lesson which has students make observations, record data about the reaction time for the trials, create a graph and form a conclusion about the effect concentration has on the speed of a chemical reaction. This lab was originally published by Flinn Scientific as a Chem Fax!  Use this link to see the full description of the experiment.
Read more