Ionic Bonding Part 2
April 08, 2015
What's Going On?
What's my Chemical Formula?
Multivalent Elements and Polyatomic Ions
Say My Name!
Learning Goal ­ I will be able to name ionic compounds and
write their chemical formulae.
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Ionic Bonding Part 2
April 08, 2015
What's my Chemical Formula?
I'm going to give you the name of an ionic compound, you identify the formula.
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Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
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Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
4
Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
5
Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
6
Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
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Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
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Ionic Bonding Part 2
April 08, 2015
Multivalent Elements
Not all elements have a single, set, charge.
Some metals can form more than one type of ion.
For example, iron has two stable ions:
Fe2+ and Fe3+
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Ionic Bonding Part 2
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Multivalent Elements
Naming ionic compounds with multivalent elements can be tricky, as we need to know which ion is present in the compound.
To identify the ion in the compound, we use Roman Numerals. If we have Fe2+, we write Iron (II) and if we have Fe3+, we write Iron (III).
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Ionic Bonding Part 2
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Example Problem
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Ionic Bonding Part 2
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Ionic Bonding Part 2
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Multivalent Elements
Examples
Write the name of each compound below.
a. Fe2O3
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Ionic Bonding Part 2
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Multivalent Elements
Examples
Write the name of each compound below.
b. FeBr2
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Ionic Bonding Part 2
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Multivalent Elements
Examples
Write the name of each compound below.
c. FeBr3
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Ionic Bonding Part 2
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Polyatomic Ions
Sometimes, a group of atoms of different elements act as a single ion, called a polyatomic ion.
OH­
Hydroxide
SO42­
Sulphate
CO32­
Carbonate
PO43­
Phosphate
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Ionic Bonding Part 2
April 08, 2015
Polyatomic Ions
As with other ionic compounds, we can use the chemical formula of a compound with a polyatomic ion to write the compound's name.
CaCO3
NaOH
Mg(OH)2
AlPO4
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Ionic Bonding Part 2
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Polyatomic Ions
We can also move from the name of the compound to the chemical formula.
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Ionic Bonding Part 2
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Example Problem
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Ionic Bonding Part 2
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Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
21
Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
22
Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
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Ionic Bonding Part 2
April 08, 2015
1. Identify the ions.
2. Determine the number of each ion required to balance the compound. (create a neutral charge)
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Ionic Bonding Part 2
April 08, 2015
Practice
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Attachments
1D CHEM ­ B1 (History of the Atom) ­ Atomic Theory.mp4