Chemistry Rules!'06

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Trends and Patterns - Period Three

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Period Three - Preparation of Period 3 oxides

Equations :

2Mg(s) + O2(g) 2MgO(s)

4Al(s) + 3O2(g) 2Al2O3(s)

S(s) + O2(g) SO2(g)

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Period Three - Preparation of Period 3 chlorides

Equations :

2Na(s) + Cl2(g) 2NaCl(s)

Mg(s) + Cl2(g) MgCl2(s)

2Al(s) + 3Cl2(g) Al2Cl6(s)

Si(s) + 2Cl2(g) SiCl4(l)

P4(s) + 10Cl2(g) 4PCl5(s)

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Period Three - Reactions with water

(1) Metals and water :

2Na(s) + 2H2O(l) 2NaOH(aq)+ H2(g)

Mg(s) + 2H2O(l) Mg(OH)2(aq)+ H2(g)

(2) Metal oxides and water :

MgO(s) + H2O(l) Mg(OH)2(aq)

SO2(g) + H2O(l) H2SO3(aq)

(3) Metal chlorides and water :

NaCl(s) (+ H2O(l)) Na+(aq) + Cl-(aq)

MgCl2(s) (+ H2O(l)) Mg2+(aq) + 2Cl-(aq)

Al2Cl6(s) + 6H2O(l) 2Al(OH)3(s) + 6HCl(aq)

SiCl4(l) + 2H2O(l) SiO2(s) + 4HCl(aq)

PCl5(s) + 4H2O(l) H3PO4(aq) + 5HCl(aq)

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Period Three - Trends in properties

Bonding -

 

 

 

 

 

Structure -

 

 

 

 

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written by Dr Richard Clarkson : © Saturday, 1 November 1997

updated : Sunday, 30th October, 2005

mail to: chemistryrules@rjclarkson.demon.co.uk

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