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REDOX

REDOX. Definition. If oxidation occurs, then reduction must also occur Any chemical process in which elements undergo a change in oxidation number is a Redox reaction. Example. 2Na + Cl 2 → 2Na + + 2Cl - This reaction can be thought of as two half reactions

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REDOX

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  1. REDOX

  2. Definition • If oxidation occurs, then reduction must also occur • Any chemical process in which elements undergo a change in oxidation number is a Redox reaction

  3. Example • 2Na + Cl2→ 2Na+ + 2Cl- • This reaction can be thought of as two half reactions • 2 Na → 2Na+ + 2e oxidation • Cl2 + 2e → 2Cl- reduction • These two reactions together are called a redox reaction

  4. Identifying Redox • SO2 + H2O + O2→ H2SO4 • NaCl + Ag(NO3) → Na(NO3) + AgCl

  5. Practice • Determine if each below is a redox reaction SO3 + H2O → H2SO4 2KNO3 → 2KNO2 + O2 H2 + CuO → Cu + H2O

  6. More Definitions • Reducing Agents – elements that undergo oxidation (the cause reduction in another element) • Oxidizing Agents – undergo reduction • Mg + Cu(NO3) → Cu + Mg(NO3) • Mg is reducing agent – being oxidized • Cu2+ is oxidizing agent – being reduced

  7. Corrosion • When a metal is reduced • When two metals are in contact, the one that is the better reducing agent (most active) will give up electrons to the other one • The metal that receives the electrons is reduced – called corrosion

  8. When zinc is wrapped around the Fe nail, Zn is oxidized, so Fe corrodes • When copper is wrapped around the Fe nail, Fe is oxidized, so Cu corrodes

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