Reaction of metals with air

Chemical Property of Metals, Reaction of Metal with Air

1. Reaction of Metals with Air Chapter-3

2. Chemical Properties of Metals Reaction of metal with Air Reaction of metal with water Reaction of metal with acid (dilute) Reaction of metal with solution of other metal salts Reaction of metal with non-metals

3. Reaction of metal with Air Metals combine with oxygen to form metal oxide. Metal + Oxygen → Metal oxide Example Magnesium + Oxygen →Magnesium Oxide 2Mg + O2 → 2MgO NOTE: This Magnesium oxide is basic in nature, it turns red litmus paper blue

4. Reaction of metal with Air Magnesium + Oxygen →Magnesium Oxide Magnesium does not react with oxygen at room temperature but on heating, magnesium burns in air with intense light and heat to form magnesium oxide

5. Reaction of metal with Air Other Examples : Copper+ Oxygen → Copper oxide 2Cu + O2 → 2CuO Aluminium + Oxygen → Aluminium oxide 4Al + 3O2 → 2Al2O3 Heated Copper Black Copper Oxide

6. Reaction of metal with Air Different metals show different reactivity towards O2. Sodium and Potassium are the most reactive metals They catch fire if kept in open Air So They are kept immersed in kerosene. Different metals show different reactivity towards O2.

7. Reaction of metal with Air Au and Ag does not react with oxygen.

8. Reaction of metal with Air Iron does not burn even on strong heating, but iron filings burn vigorously when sprinkled in the flame of the burner 3Fe + 2O 2 heat → Fe 3 O 4

9. Amphoteric Oxides Metal oxides which react with both acids as well as bases to produce salts and water are called amphoteric oxides. Examples : Al2O3 + 6HCl → 2AlCl3 + H2O Al2O3 + 2NaOH → 2NaAlO2 + H2O Sodium Aluminate

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