1. Starter Copy and complete;
We added Sodium Hydroxide, which is an a______ drop by drop to hydrochloric acid, which is an a_____. We n__________ the solution which formed Sodium Chloride and water. Sodium Chloride is more commonly known as table s______ .

2. Objectives Know how to name compounds Know how to write formulas
Know how to work out how many of each atom there are in a compound, based on a formula

3. Naming simple compounds
To name simple 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

4. Naming simple compounds
What is the name of each compound formed by these metal and non-metal elements?
nitrogen
lithium
sulphur
zinc
iodine
nickel
bromine
aluminium
oxygen
tin
chlorine
sodium
magnesium
iron
Name of compound
Element2
Element 1
iron sulphide
magnesium nitride
sodium chloride
tin oxide
aluminium bromide
nickel iodide
zinc sulphide
lithium nitride

5. Naming further compounds
Many compounds contain more than two elements.
For compounds containing two elements plus oxygen,
the ending of the other non-metal usually changes to “-ate”.
Element 1
Element 2
Element 3
Name of compound
nickel
sulphur
oxygen
nickel sulphate
magnesium
nitrogen
oxygen
magnesium nitrate
sodium
nitrogen
oxygen
sodium nitrate
copper
sulphur
oxygen
copper sulphate
aluminium
bromine
oxygen
aluminium bromate

6. Composition of compounds
A compound contains atoms from different elements that are chemically joined together.
A compound always contains a particular amount of each element. It has a fixed composition.
Compound names can get quite long and complicated,
so the symbols of the elements are used as a shorthand.
The symbols of the elements in a compound are combined to give the formula of the compound.
What is the formula of
carbon dioxide?

7. Writing a formula
A formula uses the symbols of the elements in a compound.
When there is more than one atom of each element, the number is always written after the symbol.
carbon dioxide
carbon atom = 1
CO2
formula =
oxygen atoms = 2
water
hydrogen atoms = 2
H2O
formula =
oxygen atom = 1
The formula shows the ratio of atoms in a compound.

8. What is the formula? TiO2 Li2O AlCl3
What is the formula of each of these compounds?
(In a formula put the metal first as when naming a compound.)
1. Titanium oxide
For every titanium atom there are two oxygen atoms.
Formula =
2. Lithium oxide
For every two lithium atoms there is one oxygen atom.
3. Aluminium chloride
For every aluminium atom there are three chlorine atoms.
TiO2
Li2O
AlCl3

9. What is the formula? SiCl4 MnO2 Al2O3
What is the formula of each of these compounds?
(In a formula put the metal first as when naming a compound.)
1. Silicon chloride
For every silicon atom there are four chlorine atoms.
Formula =
2. Manganese oxide
For every manganese atom there are two oxygen atoms.
3. Aluminium oxide
For every two aluminium atoms there are three oxygen atoms.
SiCl4
MnO2
Al2O3

10. What is the ratio of atoms?

11. What does a formula show?