Periodicity Period 3 Unit 5 AQA

revision cards for period 3

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  • Created by: Agent006
  • Created on: 16-03-13 21:10

Sodium

  • more reactive than magnesium
  • burns with a yellow flame
  • 2Na(s) + 2H2O(l) --->NaOH(aq) + H2(g)  - reaction with water
  • 4Na(s) + O2(g) --->Na2O(s) - reaction with oxygen

Na2O with water

  • high melting points
  • giant ionic lattice
  • soluble and reacts with water
  • alkaline - pH 14
  • nature of oxide is basic
  • Na2O + H2O --> 2NaOH
  • ions present are Na+(aq) and OH-(aq)
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Magnesium

 

  • burns with a bright white flame
  • Mg(s) + H2O(g) --->MgO(g) + H2(g)  - reaction with water
  • 2Mg(s) + O2(g) --->2MgO(s) - reaction with oxygen

MgO with water

  • high melting points
  • giant ionic lattice
  • sparingly soluble and reacts with water
  • slightly alkaline - pH 10
  • nature of oxide is basic
  • MgO + H2O --> Mg(OH)2
  • ions present are Mg2+(aq) and OH-(aq)
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Aluminium

  • burns with a bright white flame
  • 4Al(s) + 3O2(g) --->2Al2O3(s) - reaction with oxygen

Al2O3 with water

  • high melting points
  • giant ionic lattice
  • insoluble with water
  • nature of oxide is amphoteric - pH 7

 

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Silicon

  • burns with a bright white flame
  • Si(s) + O2(g) --->SiO2(s) - reaction with oxygen

SiO2 with water

  • very high melting  and boiling points
  • macromolecular
  • strong covalent bond between atoms
  • insoluble in water - pH 7
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Phosphurus

  • burns with a bright white flame
  • 4P(s) + 5O2(g) --->P4O10(s) - reaction with oxygen

P4O10 with water

  • lower melting points
  • simple molecular
  • weak intermolecular forces (VDW and Dipole Dipole)
  • soluble and reacts with water
  • slightly acidic - pH 1
  • nature of oxide is acidic
  • P4O10+ 6H2O --> 4H3PO4
  • ions present are H+(aq) and 4H2PO4-(aq)
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Sulphur

  • burns with a blue flame
  • S(s) + O2(g) --->SO2(s) - reaction with oxygen

Na2O with water

  • lower melting points
  • covalent molecular
  • soluble and reacts with water
  • acid
  • nature of oxide is acidic
  • SO2 (g) + H2O (l) --> H2SO3 (aq)         pH 3 (weak acid)
    SO3 (g) + H2O (l) --> H2SO4  (aq)        pH 1 (strong acid)
  • ions present are H+(aq) and HSO3-(aq) and H+(aq) and HSO4-(aq)
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