BRAINCAKEOxidation and Reduction
Revision notes for Oxidation and Reduction in AQA Chemistry (7404). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Oxidation and ReductionOxidation was used to describe a reaction in which oxygen was added to an element or oxygen was used to remove hydrogen from an element.
- Ionic Half EquationsOxidation is the loss of electrons.
- Oxidising and Reducing AgentsAny species that accepts electrons from another species is an oxidising agent because the other species has been oxidised.
- Oxidation StateOxidation is the addition of oxygen, removal of hydrogen, the loss of electrons or the increase in oxidation number.
- Rules for Oxidation StateRules for oxidation number: The oxidation number for uncombined elements is zero and for an ion is the charge of the ion.
- Working Out Oxidation StatesFirst use the rules to work out the oxidation state of the more electronegative element.
- SuperoxideWhen potassium is heated with oxygen a white solid K2O and an orange-yellow compound KO2 are formed.
- Redox EquationsYou can use oxidation numbers to help you understand redox reactions.
- Redox Reactions in Aqueous SolutionsSome species in aqueous solutions are neither oxidised or reduced.
- Thermite ReactionThe thermite reaction is an exothermic reaction in which aluminium reacts with iron(III) oxide.
- Half Equations from Ionic EquationsHalf equations can be derived from net ionic equations. for example 3Cu(s) + 8H+(aq) + 2NO3-(aq) → 3Cu2+ (aq) + 2NO(g) + 4H2O(l) The ionic half…
- Exam Style Question - 1Question: Deduce the oxidation state of chromium in Cr2O72- and of sulfur in SO42-.
- Exam Style Question - 2Question: Write a half-equation for the reduction of MnO4- to Mn2+ in acidic solution.
- Exam Style Question - 3Question: Combine the half-equations below to give the overall equation for the reaction of acidified manganate(VII) ions with iron(II) ions.
- Exam Style Question - 5Question: For the reaction 2Fe3+(aq) + 2I-(aq) → 2Fe2+(aq) + I2(aq), identify the species oxidised, the species reduced, the oxidising agent and the…
On the specification
- 3.1.7 Oxidation, reduction and redox equations