Periodicity
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Appearance and physical properties of sodium?
Metallic, shiny, conducts electricity (worst conductor out of the metals)
Reaction of sodium with acid
Na + acid —> H2 + salt
Reaction of sodium with cold water - equation and observations
Vigorous reaction, floats on water, fizzes, melts due to -ΔH of the reaction. NaOH is pH 13-14 2Na + 2H2O —> 2NaOH +H2
Reaction of sodium with oxygen - equation and observations
Bright yellow flame, forms white powder of Na2O 2Na + 1/2O2 —> Na2O
Appearance and physical properties of magnesium
Metallic, shiny, conducts electricity (Better than Na but worse than Al)
Reaction of Mg with cold water - equation and observations
Very slow reaction pH = 10 as Mg(OH)2 is sparingly soluble Mg + 2H2O —> H2 + Mg(OH)2
Reaction of Mg with steam - equation and observation
Much faster reaction than with cold water Mg + H2O —> MgO + H2
Reaction of Mg with oxygen - equation and observation
Bright white flame, forms white powder of MgO 2Mg + O2 —> 2MgO
Appearance and physical properties of Aluminium
Metallic, shiny, best conductor of electricity in period 3
Reaction of Al with cold water
No reaction
Reaction of Al with oxygen - equation and observations
Heat and lower into jar of O2 —> bright flame Forms white powder 4Al + 3O2 —> 2Al2O3