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IB DP Chemistry: SL復(fù)習(xí)筆記9.1.2 Deducing Oxidation Numbers

Category: IB課程, 教材筆記, 福利干貨 Date: 2022年8月4日 下午4:28

Deducing Oxidation Numbers

  • The oxidation numbers of all other atoms in their compounds can vary
  • By following the oxidation number rules, the oxidation number of any atom in a compound or ion can be deduced
  • The position of an element in the periodic table can act as a guide to the oxidation state

Oxidation Numbers & The Periodic Table

9.1.2-Oxidation-numbers-and-the-Periodic-Table-1

  • Test your understanding on the following examples:

Worked Example

State the oxidation number of the atoms in blue in these compounds or ions

a)?P2O5

b)?SO42-

c)?H2S

d)?Al2Cl6

e)?NH3

f)?ClO2-

Answers:

1.6-Electrochemistry-Table-2_Oxidation-Numbers

Are oxidation numbers always whole numbers?

  • The answer is yes and no
  • When you try and work out the oxidation of sulfur in the tetrathionate ion?S4O62-?you get an interesting result!

9.1.2-sulfur-in-the-tetrathionate-ion

The oxidation number of sulfur in S4O62-?is a fraction

  • The fact that the oxidation number comes out to +2.5 does not mean it is possible to get half an oxidation number
  • This is only a mathematical consequence of four sulfur atoms sharing +10 oxidation number
  • Single atoms can only have an integer oxidation number, because you cannot have half an electron!

 

 

 

 

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