1. Compounds

2. Compounds
Compounds are made from two or more elements, which chemically react together to form new substances.
Know that atoms cannot be created or destroyed in a reaction Understand that atoms only rearranged.

3. What elements are in….? Iron Sulphide Magnesium Oxide Copper Chloride
Lead Fluoride
Carbon Monoxide
Carbon Dioxide
Sulphur Dioxide
Carbon Tetrafluoride
Iron
Sulphur
Magnesium
Oxygen
Copper
Chlorine
Lead
Fluorine
Carbon
Oxygen
Carbon
Oxygen
Sulphur
Oxygen
Carbon
Fluorine

4. To start Name the elements in these compounds Potassium oxide
Sodium chloride
Magnesium oxide
Copper fluoride
Potassium hydroxide
Calcium sulphate
Potassium + Oxygen
Sodium + chlorine
Magnesium + Oxygen
Copper + Fluorine
Potassium, hydrogen
and Oxygen
Calcium, Sulphur and Oxygen

5. Formulae Al2O3 MgO AgNO3 Ca(OH)2 Total = 2 elements Total = 2 elements
2 atoms
3 atoms
1 atom
1 atom
Total = 5 atoms in the compound
Total = 2 atoms in the compound
Total = 3 elements
Total = 3 elements
1 atom
3 atoms
1 atom
1 atom
2 atoms
2 atoms
Total = 5 atoms in the compound
Total = 5 atoms in the compound

6. Task
No. of
atoms
No. of
elements

7. How many atoms and elements?
No. of
atoms
No. of
elements
CuSO4
Mg(OH)2
CaO
Na2O
AgNO3
CaCO3
FeF2
K2S
6 atoms 3
5 atoms 3
2 atoms 3
3 atoms 2
5 atoms 3
5 atoms 3
3 atoms 2
3 atoms 2

8. More complex examples Mg(NO3)2 Fe(OH)3 (NH4)2CO3 Fe2(SO4)3
9 atoms atom of Mg
- 2 atoms of N
- 2x3 = 6 atoms of O
9 atoms atom of Fe
- 3 atoms of O
- 3 atoms of H
14 atoms atoms of N
- 2x4 = 8 atoms of H
- 1 atom of C
- 3 atoms of O
17 atoms atoms of Fe
- 3 atoms of S
- 3x4 = 12 atoms of O