Naming Compounds
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Objectives
1. Identify the different types of compounds.
3. Identify polyatomic ions.
increasing reactivity
2. Differentiate between ionic and covalent compounds.
4. Write the name of different ionic compounds.
5. Write the name of different covalent compounds.
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Type of compounds
There are two types of compounds:
1. Ionic compounds
2. Covalent compounds
Types of compounds
Ionic compounds
Metal + non metal
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Metal + Polyatomic ion
Covalent compounds
Non metal + non metal
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Types of compound - Ionic compounds
Example 1: Iron sulfide
Iron sulfide is produced from the reaction between iron and
sulfur.
iron
+
+
sulfur

iron sulfide

One Iron atom react with one sulfur atom to
produce two molecules of water.
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Type of compounds – Ionic compounds
Example 1: Iron sulfide
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Types of compound – Ionic compounds
Example 2: Magnesium oxide
Magnesium oxide is produced from the reaction between
magnesium and oxygen.
magnesium
+
+
oxygen

magnesium oxide

Two magnesium atoms react with two oxygen
atoms to produce two molecules of magnesium
oxide .
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Type of compounds – Ionic compounds
Example 2: Magnesium oxide
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Types of compounds – Covalent compounds
Example 3: Water
Water is produced from the reaction between hydrogen and
oxygen.
hydrogen
+
+
oxygen

water

Two hydrogen atoms react with one oxygen atom
to produce two molecules of water.
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Type of compounds – Covalent compounds
Example 3: Water
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Types of compound – Ionic compounds
The second type of ionic compound is:
Metal + polyatomic ion
What are polyatomic ions?
The prefix poly- means many, so a polyatomic ion is an ion that
contains more than one atom.
Carbonate
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Nitrate
Sulfate
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Types of compound – Ionic compounds
The second type of ionic compound is:
Metal + polyatomic ion
Example 1: Calcium carbonate
Calcium
+
+
Carbonate
 Calcium carbonate

One calcium atom react with one carbonate ion (1 carbon
atom and 3 oxygen atoms) to produce one molecule of
calcium carbonate.
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Types of compound – Ionic compounds
The second type of ionic compound is:
Metal + polyatomic ion
Example 2: Magnesium sulfate
Magnesium
+
+
Sulfate
 Magnesium sulfate

One Magnesium atom react with one sulfate ion (1 sulfur
atom and 4 oxygen atoms) to produce one molecule of
Magnesium sulfate.
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Types of compound – Ionic compounds
The second type of ionic compound is:
Metal + polyatomic ion
Example 3: Beryllium nitrate
Beryllium +
Nitrate

Beryllium nitrate
Be
Be
+

One Beryllium atom react with two nitrate ion (1 nitrogen
atom and 3 oxygen atoms) to produce one molecule of
beryllium nitrate.
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Types of compound – Ionic compounds
Common polyatomic ion: Structure, names and formulas (You must memorize these!)
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Naming ionic compounds
To name ionic compounds of metals and non-metals:
1. Write down the name of the metal.
2. Write down the name of the non-metal, changing the
ending of the word to “-ide”.
What is the name of the compound made when the following
elements combine?
 magnesium and oxygen
Magnesium oxide
 sodium and chlorine
Sodium chloride
 oxygen and iron
Iron oxide
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Naming ionic compounds
To name ionic compounds of metals
and polyatomic ions:
To name ionic compounds of non
metal and polyatomic ions:
1. Write down the name of the metal.
2. Write down the name of the polyatomic
ion (positive charge).
2. Write down the name of the polyatomic
ion (negative charge).
1. Write down the name of the non metal,
changing the ending of the word to “ide”.
What is the name of the compound made when the following
elements combine?
Sodium carbonate
 Sodium and carbonate ion
 Potassium and hydroxide ion
Potassium hydroxide
 Ammonium and chlorine
Ammonium chloride
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Naming ionic compounds
What is the name of each compound formed by these metal
and non-metal elements?
element 1
element 2
compound
iron (Fe)
sulfur (S)
iron sulfide
magnesium (Mg) nitrogen (N)
magnesium nitride
sodium (Na)
chlorine (Cl)
sodium chloride
tin (Sn)
oxygen (O)
tin oxide
aluminium (Al)
bromine (Br)
aluminium bromide
nickel (Ni)
iodine (I)
nickel iodide
zinc (Zn)
sulfur (S)
zinc sulfide
lithium (Li)
nitrogen (N)
lithium nitride
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Naming covalent compounds
To name covalent compounds of non metals and non-metals:
1. Write down the name of the first non metal.
2. Write down the name of the second non-metal,
changing the ending of the word to “-ide”.
3. Add the correct prefix before the name of each non
metal.
What are Greek prefix? The numbers in Greek.
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Naming covalent compounds
What are Greek prefix? The numbers in Greek.
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Types of compounds – Covalent compounds
Example 1: Water
Water is produced from the reaction between hydrogen and
oxygen, 2 non metals. Water is a covalent compound.
hydrogen
+
+
oxygen

water

The common name for this compound is water, While the
systematic name is dihydrogen monoxide.
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Naming covalent compounds
Common names are usually used for covalent compounds,
below are some examples:
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Naming covalent compounds
What is the name of each compound formed by these metal
and non-metal elements?
element 1
element 2
compound
1Carbon (C)
2Oxygen (O)
Carbon dioxide
1Nitrogen (N)
4Oxygen (O)
Nitrogen tetraoxide
2Nitrogen (N)
3Oxygen (O)
Dinitrogen trioxide
4Phosphorus (P) 8Oxygen (O)
Tetraphosphorus trioxide
1Iodine (I)
7Fluorine (F)
Iodine heptafluoride
1Carbon (C)
1Oxygen (O)
Carbon monoxide
2Sulfur (S)
2Bromine (Br) Disulfur dibromide
1Phosphorus (P) 1Sulfur (S)
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Phosphorus sulfide
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Writing a word equation
A word equation can be used to describe any chemical
reaction.
The steps for writing a word equation are:
1. On the left-hand side, put the name(s) of the reactant(s).
If there are two or more reactants, link them with a + sign.
2. In the middle, draw an arrow ().
3. On the right-hand side, put the name(s) of the product(s).
If there are two or more products, link them with a + sign.
reactant 1
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+
reactant 2  product 1
+
product 2
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Homework: Completing word equations
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