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Presentation On Redox Reactions (Part 2)

Home > PowerPoint Slides > Presentation On Redox Reactions (Part 2)
Published in: Chemistry | Science
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This PPT is suitable for the IGCSE and O Level Chemistry students. It only provides theoretical background of the topic. The worksheets and topical questions will be discussed during the tutoring sessions

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  1. Redox Reactions (Part 2) Chemistry (IGCSE / O-Level)
  2. What will you learn in this lesson? • Use a Roman numeral to indicate the oxidation number of an element in a compound • Identifying redox reactions by changes in oxidation number • Identifying redox reactions by the color changes involved when using acidified aqueous potassium manganate(Vll) or aqueous potassium iodide
  3. Oxidation Numbers A number given to show whether an element has been oxidised or reduced, the oxidation number of a simple ion is simply the charge on the ion. Different oxidation numbers show different valencies of same element Roman numerals with the elements show the oxidation number of that element in a compound +7 copper(l) oxide, Cu02 topper(ll) oxide, COO ironar) chloride, FeC12 iron (Ill) chloride, FeC13 manganese(ll) o*idee MnO manganese(IV) oxide, Mn02 manganese(VII) oxide, Mn207
  4. Oxidation Numbers (contd.) +7 MnO.— +6 so. SOB-.crp,a- +4 SOP C02 +1 H % HCI O ClyNuFe,OYH2 -3 NHI, Figure 10.9: The range of Oxidation numbers shown by various elements. Note how oxidation numbers are written, with the sign first followed by the number.
  5. Oxidation Numbers (contd.) Following are the rules for working out the oxidation number of an element The oxidation number of the uncombined element is zero (o) The oxidation number of the element in a simple monoatomic ion is the charge in the ion The oxidation number of hydn>gen is usually +1 oxidation number of oxygen is usually —2 sum of the oxidation numbers in a compound is zero (O) The Sum of the oxidation numbers in a compound ion (molecular ion) is the charge on the ion In H2 the oxidation number of H is O In C12 the oxidation number of CI is O In Zn2* the oxidation number Of Zn is +2 In 02— the oxidation number of O is —2 In HCI, the oxidation number of H is +1 and the oxidation number of CI is —1 In water, the oxidation number of H is +1 and the oxidation number of O is —2 In water (H20), the oxidation number of is +1 and the oxidation number Of O is —2 In the manganate(VII) ion (Mn04-), the oxidation number of Mn is +7
  6. Oxidation Numbers (contd.) Oxidation number not only helps in naming certain compounds. It also helps in identifying that either oxidation or reduction has occurred in a reaction. Increase in oxidation number shows that the atom or ion is oxidised Decrease in oxidation number shows the atom or ion is reduced Zn(s) + Zna.(aq) + Cuts) o oxidation number Changes C12(g) + 2KCl(aq) + 12(aq) oxidation number oxidation Changes in «id:ati«' number during halogen displacement reaction.
  7. Color Test for Oxidising Agent • Potassium iodide is useful for testing oxidising agent • I - ion is oxidized to 12 • The color of solution is changed from colorless to yellow-brown or dark blue in presence of the indicator starch POT A SS r001D
  8. Color Test for Reducing Agent • Acidified potassium manganate (Vll) is useful for testing reducing agents • Manganate (Vll) in Mn04- is reduced from oxidation state +7 to +2 • Solution containing manganate (Vll) ion is purple in color. • Solution reduced to Mn2+ ion is pale pink or colorless
  9. Summary of Oxidation and Reduction Oxidation: Reduction: 1. 2. 3. A reaction in which oxygen is added to an element or compound A reaction involving loss of electrons in atoms, molecules or ions A reaction in which the oxidation state of element is increased 1. 2. 3. A reaction in which oxygen is removed from an element or compound A reaction involving gain of electrons in atoms, molecules or ions A reaction in which the oxidation state of element is decreased
  10. Practice Questions 7 What number of the element underlined in thefollowing elementy, compounds andions? b CIO.- e QO"2- 8 Which a.ent each of the following reactions? a mg(s) + ZnSOdaq) MOSO&q) + Zn(s) c 5FeE+(aq) + + 4H20(1) 9 Describethealourchange you would see in reactong b end cln Question 8.

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