ChemistryCode 5070
Redox
What this topic asks you to be able to do
- Apply a Roman numeral to show an element's oxidation number inside a compound
- Define a redox reaction as one in which reduction and oxidation take place at the same time.
- Define oxidation by reference to: (a) taking in oxygen (b) giving up electrons (c) a rise in oxidation number
- Define reduction by reference to: (a) losing oxygen (b) taking on electrons (c) a fall in oxidation number
- Identify redox reactions as ones in which oxygen is gained and lost, or electrons are gained and lost
- Identify redox reactions from shifts in oxidation number, applying these rules: (a) an element in the uncombined form has an oxidation number of zero (b) for a monatomic ion, the oxidation number matches the charge on the ion (c) the oxidation numbers within a compound add up to zero (d) the oxidation numbers within an ion total the charge on that ion
- Identify redox reactions from the colour shifts observed when acidified aqueous potassium manganate(VII) or aqueous potassium iodide is used.
- Define an oxidising agent: it oxidises a different substance and, in doing so, is reduced
- Define a reducing agent: it reduces a different substance and, in doing so, is oxidised
- Identify, within redox reactions, the oxidation, oxidising agents, reduction and reducing agents.