Redox

What the syllabus asks of you

• Use a Roman numeral to indicate the oxidation number of an element in a compound
• Define redox reactions as involving simultaneous oxidation and reduction
• Define oxidation as gain of oxygen and 6 Define oxidation in terms of: reduction as loss of oxygen (a) loss of electrons (b) an increase in oxidation number 7 Define reduction in terms of: (a) gain of electrons (b) a decrease in oxidation number
• Identify redox reactions as reactions involving 8 Identify redox reactions as reactions involving gain and loss of oxygen gain and loss of electrons
• Identify oxidation and reduction in redox 9 Identify redox reactions by changes in oxidation reactions number using: (a) the oxidation number of elements in their uncombined state is zero (b) the oxidation number of a monatomic ion is the same as the charge on the ion (c) the sum of the oxidation numbers in a compound is zero (d) the sum of the oxidation numbers in an ion is equal to the charge on the ion 10 Identify redox reactions by the colour changes involved when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide 11 Define an oxidising agent as a substance that oxidises another substance and is itself reduced 12 Define a reducing agent as a substance that reduces another substance and is itself oxidised 13 Identify oxidising agents and reducing agents in redox reactions