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REDOX REACTIONS.pptx

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Masungulo Maluleke
Masungulo Maluleke

The document defines oxidation, reduction, and redox reactions. Oxidation is an increase in oxidation state through electron loss, while reduction is a decrease in oxidation state through electron gain. Redox reactions involve the coupled oxidation and reduction of reactants, where one substance loses electrons that are gained by another. Examples of redox reactions in everyday life are given. The terms oxidizing agent and reducing agent are defined based on whether a substance is undergoing oxidation or reduction in a reaction. Oxidation numbers represent the charge of an atom in a compound and can vary depending on the compound.

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REDOX REACTIONS
Objectives Define oxidation, reduction, oxidizing agent, reducing agent, and oxidation numbers. Examples of redox reactions. Redox reactions in everyday lives.
Oxidation A chemical reaction in which the atoms or ions of an element experience an increase in its oxidation state. It can also be described as a process whereby a molecule/element/ion loses an electron or electrons during a chemical reaction. e.g. Na Na+ + e-
Reduction A chemical reaction in which the atoms or ions of an element experience a decrease in its oxidation state. It can also be described as a process whereby a molecule/element/ion gains an electron or electrons during a chemical reaction. e.g. Cl + e- Cl-
Reduction-Oxidation Reactions The oxidation and reduction processes always occur simultaneously. Reduction-oxidation reactions are shortened to redox reactions. The electrons lost by one substance are gained by another substance. e.g. The reaction of Na and Cl to produce NaCl is a redox reaction. Cl + e- Cl- + Na Na+ + e- => 2Na + Cl2 2NaCl
Oxidizing and Reducing agents Oxidizing agent A substance that is reduced(undergoes reduction) during a redox reaction. In the NaCl redox reaction, Cl- is the reducing agent. Reducing agent A substance that is oxidized(undergoes oxidation) during a redox reaction. In the NaCl redox reaction, Na+ is the oxidizing agent.
Oxidation Numbers Oxidation number is the charge which an atom possesses when all other atoms are removed from it as ions. The charge may be positive or negative. The oxidation number(state) of an element varies depending on the nature of compound in which it is present. e.g. Oxygen (O) in KMnO4 has a -2 oxidation number.
REDOX REACTIONS.pptx
References Foltz, C. (2010). Chapter 19.1: Oxidation and Reduction [PowerPoint presentation]. Available at: /cfoltz/chapter-191-oxidation-and-reduction (Accessed: 19 August 2022). Dr. Srivastava, T. (2010). Redox reaction [PowerPoint presentation]. Available at: /tanujanautiyal/redox-reactions-59297821 (Accessed: 19 August 2022). Guillotine, N. (2013). Redox reaction Group C. [PowerPoint presentation]. Available at: /NoxianGuillotine/redox-reaction-group-c (Accessed: 19 August 2022). Xinleho. (2013). Redox reaction (GROUP E) [PowerPoint presentation]. Available at: /xinleho/redox-reaction-group-e (Accessed: 19 August 2022). Gm point Blank. (2012). Redox reaction. [PowerPoint presentation]. Available at: /nelsonproflay/redox-reaction-14262872 (Accessed: 19 August 2022).

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REDOX REACTIONS.pptx

  • 2. Objectives Define oxidation, reduction, oxidizing agent, reducing agent, and oxidation numbers. Examples of redox reactions. Redox reactions in everyday lives.
  • 3. Oxidation A chemical reaction in which the atoms or ions of an element experience an increase in its oxidation state. It can also be described as a process whereby a molecule/element/ion loses an electron or electrons during a chemical reaction. e.g. Na Na+ + e-
  • 4. Reduction A chemical reaction in which the atoms or ions of an element experience a decrease in its oxidation state. It can also be described as a process whereby a molecule/element/ion gains an electron or electrons during a chemical reaction. e.g. Cl + e- Cl-
  • 5. Reduction-Oxidation Reactions The oxidation and reduction processes always occur simultaneously. Reduction-oxidation reactions are shortened to redox reactions. The electrons lost by one substance are gained by another substance. e.g. The reaction of Na and Cl to produce NaCl is a redox reaction. Cl + e- Cl- + Na Na+ + e- => 2Na + Cl2 2NaCl
  • 6. Oxidizing and Reducing agents Oxidizing agent A substance that is reduced(undergoes reduction) during a redox reaction. In the NaCl redox reaction, Cl- is the reducing agent. Reducing agent A substance that is oxidized(undergoes oxidation) during a redox reaction. In the NaCl redox reaction, Na+ is the oxidizing agent.
  • 7. Oxidation Numbers Oxidation number is the charge which an atom possesses when all other atoms are removed from it as ions. The charge may be positive or negative. The oxidation number(state) of an element varies depending on the nature of compound in which it is present. e.g. Oxygen (O) in KMnO4 has a -2 oxidation number.
  • 9. References Foltz, C. (2010). Chapter 19.1: Oxidation and Reduction [PowerPoint presentation]. Available at: /cfoltz/chapter-191-oxidation-and-reduction (Accessed: 19 August 2022). Dr. Srivastava, T. (2010). Redox reaction [PowerPoint presentation]. Available at: /tanujanautiyal/redox-reactions-59297821 (Accessed: 19 August 2022). Guillotine, N. (2013). Redox reaction Group C. [PowerPoint presentation]. Available at: /NoxianGuillotine/redox-reaction-group-c (Accessed: 19 August 2022). Xinleho. (2013). Redox reaction (GROUP E) [PowerPoint presentation]. Available at: /xinleho/redox-reaction-group-e (Accessed: 19 August 2022). Gm point Blank. (2012). Redox reaction. [PowerPoint presentation]. Available at: /nelsonproflay/redox-reaction-14262872 (Accessed: 19 August 2022).