Naming binary compounds part ii
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Transcript of Naming binary compounds part ii
Naming Binary Compounds Part II
The Stock System
Objectives
Name simple binary compounds using their formulae.
Given the name, write the formula of a simple binary compounds
The Stock System
The Stock System is used when the cation or the first part of the compound has more than one possible charge.
The charge of the cation/metal is denoted by a Roman Numeral.
Roman Numerals
1 = I
2 = II
3 = III
4 = IV
5 = V
6 = VI
7 = VII
8 =VIII
You will never use 8 and very seldom numbers over 4.
Special Case: Hg+1
Hg+1 is never by itself.
When you see it in a formula it will look like Hg2 and have a +2 charge
Example: Hg2Cl2 is mercury(I) chloride
However, Hg+2 is mercury(II)
Example HgCl2 is mercury(II) chloride
Examples
Iron has 2 possible charges Fe+2 & Fe+3
They would be Fe (II) or Fe (III)
Ions/metals that only have one charge there is no reason to use the Roman Numerals
Examples
Fe2O3 and FeO
In Fe2O3 the Iron has a +3 charge so the name would be: Iron (III) Oxide
In FeO the Iron has a +2 charge so the name would be: Iron (II) Oxide
Try It Your Self
Step I: Determine the charge on the metals using the non metal part (ex. O and Cl)
Step II: Write the correct name.
Here are your problems: CuO and CuCl
Now pause the video and try them.
Answers
Copper (II) Oxide
Copper (I) Oxide
Next Up Naming Non-Metal Binary Compounds
Prepare To Practice In Class