Chemistry - Oxides

Oxides are binary compounds formed by the reaction of oxygen with another element. They are generally classified into four types based on their acid-base properties: acidic, basic, amphoteric, and neutral.

Acidic Oxides: Formed when non-metals react with oxygen (e.g., $SO_{2}$, $CO_{2}$, $P_{4}O_{10}$). These oxides react with bases to form salt and water, and most dissolve in water to produce acidic solutions (e.g., $CO_{2} + H_{2}O \rightarrow H_{2}CO_{3}$).

Basic Oxides: Formed when metals react with oxygen (e.g., $MgO$, $CuO$, $Na_{2}O$). These oxides react with acids to form salt and water ($Basic\ Oxide + Acid \rightarrow Salt + Water$). If soluble in water, they form alkaline solutions called hydroxides.

Amphoteric Oxides: These are metallic oxides that show both acidic and basic properties. They react with both acids and strong bases to form salt and water. Common examples in the IGCSE syllabus are Aluminum oxide ($Al_{2}O_{3}$) and Zinc oxide ($ZnO$).

Neutral Oxides: These non-metal oxides do not react with either acids or bases. Common examples include Carbon monoxide ($CO$), Nitrous oxide ($N_{2}O$), and Nitric oxide ($NO$).