SS2 Second Term Chemistry Lesson Note – Compounds of Oxygen

The content is just an excerpt from the complete note for SS2 Second Term Chemistry Lesson Note – Compounds of Oxygen. Check below to download the complete DOCUMENT

PERIOD 4:  COMPOUNDS OF OXYGEN

Binary Compounds of Oxygen- Classification of Oxides

Based on their acid –base properties, there are four classes of oxides of elements in Periods 2 and 3: acidic, basic, amphoteric and neutral.

Acid oxides: These are of non-metals which dissolve in water to form acidic solution. And react with base to form salt and water. Examples of acid oxides are P₅O₁₀, NO₂, SO₂, SiO₂ etc. They are called acid anhydride. E.g.

CO₂ +NaOH       →    Na₂CO₃   +   H₂O

SO₃ + 2KOH  →  K₂SO₄    +   H₂O

NOTE: SiO₂ is insoluble in water

Basic oxides: They are metallic oxides that are basic in nature because they react with acids to form salt and water only.  Examples are K₂O, MgO, CaO, Li₂O etc. Soluble basic oxides are called alkali. E.g.

Na₂O_(g)  +   H₂O_(l) →  2NaOH_(aq)

Na₂O_(s) + 2HCl_(aq)  →  2NaCl_(aq)   +  H₂O_(l)

Amphoteric oxides: These are oxides that behave both like acidic and basic oxides. They react with both acid and base E.g. ZnO, Al₂O₃, PbO etc

ZnO(s) + H₂SO_4(aq) → ZnSO₄    +   H₂O_(l)

To gain full access to the note: DOWNLOAD FILE