4.3 Redox

Descripción

AS - Level (4 - Acids and Redox) Chemistry Mapa Mental sobre 4.3 Redox, creado por Bee Brittain el 13/04/2016.
Bee Brittain
Mapa Mental por Bee Brittain, actualizado hace más de 1 año
Bee Brittain
Creado por Bee Brittain hace más de 8 años
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Resumen del Recurso

4.3 Redox
  1. Oxidation Number
    1. Can be thought of as the number of electrons involved in bonding to a different element
      1. Helps when writing formulae and balancing equations as a check that all electrons are counted for
    2. Oxidation Number RULES
      1. Always zero for elements
        1. Each atom in a compound has an oxidation number
          1. An oxidation number has a sign which is placed before the number
          2. Oxidation Numbers
            1. Element
              1. Oxidation Number
                1. -2
                  1. O
                    1. CaO
                      1. +1
                        1. H2S
                          1. H
                            1. -1
                              1. HF
                                1. F
                                  1. +2
                                    1. MgCl2, CaO
                                      1. Mg 2+, Ca2+
                                        1. -1
                                          1. HCl, KBr, CaI2
                                            1. Cl- , Br- , I-
                                  2. Example
                                    1. Special Cases
                                      1. Oxidation Numebr
                                        1. -1
                                          1. NaH, CaH2
                                            1. H in metal hydrides
                                              1. -1
                                                1. H2O2
                                                  1. O in peroxides
                                                    1. +2
                                                      1. F2O
                                                        1. O bonded to F
                                                  2. Element
                                                    1. Example
                                                  3. Using Roman numerals in naming
                                                    1. The roman numeral shows the oxidation state (number) of the element, without a sign
                                                      1. E.g/ Iron(II) represents Fe2+ with oxidation number +2
                                                        1. E.g/ Iron (III) represents Fe3+ with oxidation number +3
                                                    2. Redox Reactions
                                                      1. Reduction and Oxidation
                                                        1. O.I.L R.I.G
                                                          1. Oxidation Is Loss (of electrons) Reduction Is Gain (of electrons)
                                                          2. Redox reactions involve reduction AND oxidation
                                                            1. If something is reduced, something else must be oxidised
                                                          3. Reduction is a decrease in oxidation number
                                                            1. Oxidation is an increase in oxidation number
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