3.2.4 - Period 3 Elements Flashcards
Equation for reaction between sodium and water
2Na + 2H2O –> 2NaOH + H2
Equation for reaction between magnesium and water
Mg + 2H2O –> Mg(OH)2 + H2
Sodium and Magnesium reactivity
Sodium is more reactive than magnesium as it only has to lose one electron to form an ion whereas magnesium has to lose two.
Magnesium and steam
Steam can be used to increase the speed of reaction. Steam provides the reaction with greater energy resulting in a violent reaction
Flame colour of magnesium when reacting with steam
bright white
Equation for reaction between magnesium and steam
Mg + H2O –> MgO + H2
Period 3 elements reacting with oxygen
Form oxides with each element in their highest oxidation state. This number is often the same as the group number
Oxide of sodium and oxygen
Sodium oxide (Na2O), +1 oxidation state
Oxide of magnesium and oxygen
magnesium oxide (MgO), +2 oxidation state
Oxide of aluminium and oxygen
Aluminium oxide (Al2O3), +3 oxidation state
Oxide of silicon and oxygen
Silicon dioxide (SiO2), +4 oxidation state
Oxide of phosphorus and oxygen
Phosphorus oxide (P4O10), +5 oxidation state
Oxide of sulfur and oxygen
Sulfur dioxide (SO2), +4 oxidation state (Can react to form SO3 with +6 oxidation state but requires high temp and catalyst)
Structure & Bonding of Na2O
Ionic
Relative melting point of Na2O
1250°c
Reactivity of Na2O
Vigorous
Structure & Bonding of MgO
Ionic
Relative melting point of MgO
2750°c
Reactivity of MgO
Vigorous
Structure & Bonding of Al2O3
Ionic (Covalent Character)