Period 3

Reaction of Sodium with Water
Vigorous reaction, resulting in a very alkaline solution. Na(s) + H2O(l) = NaOH(aq) + ? H2
Reaction of Sodium with Chlorine
Burn in Cl gas. Na(s)+ 1/2 Cl2(g) = NaCl (s)
Bonding in Sodium Chloride
Giant lattice structure consisting of ionic bonds
Reaction of Sodium Chloride with Water
Dissociates in water to produce a neutral solution
Reaction of Magnesium with Water
Slowly effervesces to form a alkaline solution with a pH of around 10.
Mg(s)+ 2 H20(l) = Mg(OH)2 (aq) + H2
Magnesium and Oxygen
Burns in oxygen with a very bright flame.
Mg(s) + 1/2 O2 = MgO (s)
Bonding in Magnesium Oxide
Giant ionic structure
Magnesium Oxide and Water
MgO(s) + H2O = Mg(OH)2 (aq)
produces solution with pH around 10.
Magnesium and Chlorine
Burn in Cl gas.
Mg(s) + Cl2(g) = MgCl2 (s)
Bonding in Magnesium Chloride
Giant Ionic compound but bonds show some covalent character.
Magnesium Chloride and Water
Dissociates in water to give a slightly acidic solution – aprox pH 6.5
Aluminium and Oxygen
Reacts immediately at room temperature
2 Al(s) + 1 1/2 O2 (g) = Al2O3(s)
Bonding in Aluminium Oxide
Giant ionic structure but bonds show some covalent character due to the large charge density of th Al3+ ion.
Aluminium Oxide and Water
It is completely insoluble in Water
Aluminium and Chlorine
Pass Cl gas over hot Al
2Al(s) + 3Cl2(g) = Al2Cl6
Bonding in Aluminium Chloride
Mostly covalent bonds. 2 dative convalent bonds are formed from Cl to Al[image]
Aluminium Chloride and Water
Dissociates in water to form the Al 3+ hexaaqua ion, then loses H+ to create [Al(H2O)5(OH)] 2+ and so gives off 1 h+, giving a pH as low as 3
Silicon and Chlorine
on being heated with Cl gas
Si(s) + 2Cl2(g) = SiCl4(s)
Bonding in Silicon Chloride
Simple Molecular structure with covalent bonding[image]
Silicon Chloride and Water
Vigourous raction to form SiO2 (s) and HCl.
SiCl4(s) + 2H2O = SiO2 (s) + 4 HCl (aq)
Reaction of Phosphorus and Chlorine
P4 (s) + 10Cl2 (g) = 4 PCl5 (s)
Bonding in Phosphorus Chloride
Simple molecular structure with covalent bonding.
Reaction of Phosphorus Chloride and Water
PCl5(s)+4H20(l) =5 HCl (aq) + H3PO4(aq)
Vigorous effervescence. Acidic solution formed.
Reaction of Sulphur and Oxygen
S8 (s) + 8O2 (g) = 8SO2(s)
Burns with a blue flame
Bonding in Sulphur Dioxide and Sulphur Trioxide
Sulphur Dioxide- [image]Sulphur trioxide- [image]
Reaction of Sulphur Dioxide and Sulphur Trioxide with Water
Sulphur Dioxide-
SO2(g) + H20 (l) = H2SO3 (aq)
Sulphur Trioxide
SO3(g) + H20 (l) = H2SO4 (aq)
Reaction of Chlorine with Water
Cl2(g) + H20 (l) = 2HCl (aq) + 1/2 O2
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