1. Compounds Learning Intentions: I know the rules for naming compounds
I know the difference between a mixture and a compound
I know that the properties of a compound are different from the elements that it contains
Success Criteria:
I can determine whether a substance is a mixture or a compound
I can name ‘-ide’ and ‘-ate’ compounds
I can identify the elements present from the name of a compound
I have carried out experiments showing the differences in properties between the elements and the compound they make.

2. Compounds
The properties of compounds are usually very different from the properties of the elements they contain. 

3. Experiment 2: Magnesium + Oxygen
Magnesium + Oxygen Magnesium oxide
grey colourless white
Solid gas solid

4. Experiment 3: Iron and Sulphur
Iron + Sulphur Iron sulphide

5. Iron
Sulphur
Iron Sulphide
Colour
Grey
Yellow
Black
Attracted to magnet?
Yes No
Reaction with hydrochloric acid?
Hydrogen formed
No reaction
Hydrogen sulphide formed

6. Signs of a Chemical Reaction

7. Mixture: two or more substances that are mixed but are not chemically joined.

8. Naming Compounds
Most compounds can be named using the following rules:
The names of the elements are written from left to right as they appear on the periodic table,
e.g. sodium chloride & lithium fluoride.

9. If there are only two elements forming the compound then the ending of the second name is ‘-ide’.
E.g. copper + sulphur copper sulphide
sodium + oxygen sodium oxide.

10. If the compound contains oxygen and two other elements, the ending of the second name is usually ‘-ate’. E.g. copper, sulphur & oxygen is copper sulphate.
(Later, you will be introduced to ‘-ites’ which also contain oxygen & two other elements.

11. More Common Names for Compounds
MgSO4 …….. Magnesium sulphate
NaNO3 …….. Sodium nitrate
CaCO3 …….. Calcium carbonate
KOH …….. Potassium Hydroxide
…..(SO4)  Sulphates
…..(NO3)  Nitrates
…..(CO3)  Carbonates
…..(OH)  Hydroxides 11

12. copper + carbon + oxygen sodium + nitrogen + oxygen
elements present
name of compound 1.
magnesium oxide 2.
silver chloride
3. lead + sulphur
4. iron + oxygen 5.
copper carbonate 6.
zinc sulphate
7. iron + sulphur + oxygen
8. calcium + carbon + oxygen 9.
sodium nitrate
magnesium + oxygen
silver + chlorine
lead sulphide
iron oxide
copper + carbon + oxygen
zinc + sulphur + oxygen
iron sulphate
calcium carbonate
sodium + nitrogen + oxygen 12

13. Elements present
Compound
iron sulphide
sodium chloride
magnesium nitride
hydrogen, fluorine
lithium, oxygen
calcium, iodine
copper sulphate
lead phosphate
aluminium sulphite
zinc carbonate

14. Naming Compounds
You can often use the chemical formula to work out the name of the compound. (This does not always work though!)

15. For the compounds below, write down their names. a) ZnCl2 b) ZnBr2
c) MgBr2
d) CaCl2
e) NaI
f) AgBr
g) KCl
Zinc chloride
Zinc bromide
Magnesium bromide
Calcium chloride
Sodium iodide
Silver bromide
Potassium chloride 15

16. Naming Compounds For the compounds below, write down their names.
a) Na2SO4
b) CaSO4
c) CuCO3
d) AgNO3
e) NaOH
f) Ca(NO3)2
g) Mg(OH)2
Sodium sulphate
Calcium sulphate
Copper carbonate
Silver nitrate
Sodium hydroxide
Calcium nitrate
Magnesium hydroxide 16