CHEM 1A03 Chapter Notes - Chapter 3: Iron(Ii) Oxide, Hong Kong Diploma Of Secondary Education, Stainless Steel

• School: McMaster University
• Department: Chemistry
• Course: CHEM 1A03
• Professor: David Brock

Document Summary

Methods of extraction of metal: (in descending order of di culty: electrolysis: pass electricity throuhg molten ore (e. g. 2al2o3(l) 4al(l) + 3o, heating with carbon: heat with carbon or carbon monoxide. 2(g): heating alone: heat the metal alone (e. g. 2hgo(s) 2hg(s) + o, displacement: use more reactive metal to displace metals in solution. Reactivity of metal: how readily a metal reacts. Increases with tea tendency to form positive ions. More reactive metals are more di cult to extract. Time of discovery of metal: depends on reactivity (di culty of extraction ) and abundance. Rusting: the corrosion of iron to form iron (ii) oxide. Factors that speed up rusting: presence of acidic solution, presence of soluble salts, presence of less reactive metal, presence of uneven or sharply pointed regions, high temperature. Connect negative terminal of electric source to iron, supplying electrons and preventing formation of positive ions. Put more reactive metal with iron so that the metal reacts instead of iron.