CHEMISTRY II Worksheet for Chapter 5 REDOX REACTIONS 1. Define the following: Oxidation Reduction Oxidising Agent Reducing Agent 2. For the following reactions identify which substances are oxidised and which are reduced, and also which are the oxidising agents and which are the reducing agents a) b) c) 3. Calculate the oxidation number of chromium in each of the following species CrSO4 Cr2O3 4. • • 5. Sn + 2Ag+ Sn2+ + 2Ag Fe + Mg2+ Fe2+ + Mg 2Al + 3Hg2+ 2Al3+ + 3Hg CrO2CrO42- Using the half equations on page 43 of your class notes, write an overall redox equation for: the reduction of dichromate by sulfur dioxide the reaction occurring when an iron nail is dipped into a solution of copper(II) sulfate – a red-brown precipitate coats onto the nail and analysis shows the presence of iron (II) ions in solution. Redox reactions are found all around us in life. Give an example of a naturally occurring redox reaction and why it is important.