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Ox. No. of Oxides & Hydroxides of Period 3 Elements

Nicholas Ng

on 13 May 2013

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Transcript of CHEMISTRY

Recap: Basic oxides:
Oxides which react with water to form bases.

Amphoteric oxides:
Oxides which display both basic AND acidic properties.

Acidic oxides:
Oxides which react with water to form acids.

Argon is a noble gas & does not
form an oxide. Going Across Period 3 Oxides of Period 3 - Maximum oxidation no. of Period 3 element increases

-Oxidation no. of Period 3 element is always +ve (O, which has Ox. No. -2, is more electronegative than ALL Period 3 elements)

-Oxides of elements go from Basic Amphoteric Acidic Basic Oxides -Sodium & Magnesium Amphoteric Oxide -Aluminium Acidic Oxides -Silicon, Phosphorus, Sulfur & Chlorine THANK YOU
FOR VIEWING ;) Common oxides: Silicon: Silicon dioxide Phosphorus: Phosphorus(V) oxide,
Phosphorus(III) oxide Sulfur: Sulfur dioxide,
Sulfur trioxide Chlorine: Dichlorine Heptoxide,
Chlorine(I) Oxide Common oxides: Sodium: Sodium oxide Magnesium: Magnesium oxide Common oxide: Aluminium(III) oxide Na, Mg, Al, Si, P, S, Cl, Ar Oxides and Water Hydroxides of Na & Mg -Aluminium oxide DOES NOT react or dissolve in water at room temperature.

-It reacts with both alkaline and acidic solutions.

-It displays both basic and acidic properties.

-It behaves as a base when reacted with an acid & forms salt + water.

-It behaves as an acid when reacted with an alkali & forms salt. Reaction with an acid: Reaction with Hot, Concentrated alkali: Oxides and Water Acids of P & S Oxidation No. of Elements Na₂O Na Al MgO Al₂O₃ Mg SiO₂ Si P₄O P SO₂ S +1 +2 +3 +4 +5 SO₃ +4 +6 Cl Cl₂O +7 -Phosphorus reacts vigorously and dissolves in water to form an acidic solution of phosphoric(V)acid.

P₄O₁ ₀(s) + 6H₂O(l) →----> 4H₃PO₄(aq) 0 -The oxides of sulfur, SO₂ and SO₃ both react and dissolve in water forming acidic solutions, forming sulfuric(IV) acid & sulfuric(VI) acid.

SO₂(g) + H₂O(l) ----> H₂SO₃(aq)
SO₂(g) + H₂O(l) ---->→ H₂SO₄(aq) -Silicon dioxide has no reaction with water. -Phosphorus(III)oxide forms Phosphoric(V) acid when reacted with water.

-Sulfur dioxide & sulfur trioxide forms sulfuric(IV) acid & sulfuric(VI) acid respectively when reacted with water.

H₂SO₄ Al₂O₃(s) + 6HCl(aq) ----> 2AlCl₃(aq) + 3H₂O(l) Al₂O₃(s) + 2NaOH(aq) + 3H₂O(l) ---> 2Na[Al(OH)₄](aq) -Sodium oxide reacts with water to form sodium hydroxide.

Na₂O(s) + H₂O(l) ---> 2NaOH(aq) -Magnesium oxide reacts with water to form magnesium hydroxide.

MgO(s) + H₂O(l) ---> Mg(OH)₂(aq) Sodium Hydroxide (strongly alkaline solution)

NaOH Magnesium Hydroxide (weakly alkaline solution)

Mg(OH)₂ 10 7 P₄O₆ 6 +3
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