iGCSE Scheme of Work Year 10 July 2011 Electrolysis Lesson Learning Objectives Activities Assessment Safety Other emphasis Lesson 1 Introducing Electrolysis understand that an electric current is a flow of electrons or ions understand why covalent compounds do not conduct electricity understand why ionic compounds conduct electricity only when molten or in solution describe experiments to distinguish between electrolytes and nonelectrolytes understand that electrolysis involves the formation of new substances when ionic compounds conduct electricity Starter - review properties of ionic and covalent compounds with regard to conducting electricity., in terms of structure. Practical - See worksheet Which substances conduct electricity? Discussion review practical and discuss why each substance will conduct or not and relate to structure Students make notes relating structure to electrical conductivity Plenary
iGCSE Scheme of Work Year 10 July 2011 Electrolysis Lesson Learning Objectives Activities Assessment Safety Other emphasis Lesson 2 Electrolysis of molten salts. understand that electrolysis involves the formation of new substances when ionic compounds conduct electricity describe experiments to investigate electrolysis, using inert electrodes, of molten salts such as lead(II) bromide and predict the products Starter Show pupils samples of bromine, chlorine, lead and copper. Ask them to suggest ionic compounds which could be made from these elements. Review formation of ions and properties of ionic compounds. MAIN Introduce Electrolysis: definitions for electrolysis, anode, cathode, electrolyte Demo Lead Bromide. Draw a diagram including circuit first. Pupils to explain observations and help to deduce equations on board as a whole class activity. Why does molten lead bromide conduct? Plenary Either e-science or science consortium electrolysis of lead bromide can be used. Homework sheet needed Or Page 118 Q 2 and 4 Lead bromide demo in fume cupboard V Drawing a labelled diagram of the electrolysis equipment. A : Listening to explanations of different words. K practical
iGCSE Scheme of Work Year 10 July 2011 Electrolysis Lesson Learning Objectives Activities Assessment Safety Other emphasis Lesson 8 Electrolysis Calculations recall that one faraday represents one mole of electrons Calculate the amounts of the products of the electrolysis of molten salts and aqueous solutions. Starter – consider what half equations really mean Consider how we measure quantities of electricity, amps, coulombs, Q = I x t in secs Introduce Faraday as electricity which flows when one mole of electrons passes a point in a circuit 6.02 x 1023 electrons 1 faraday = 96000 coulombs Students carry out simple calculations from half equations of how many moles of metal is produced by one faraday of electricity Calculating mass of metal formed at cathode, see iGCSE textbook page 196. Give students a worked example Students carry out simple calculations – see work sheet.
iGCSE Scheme of Work Year 10 July 2011 Electrolysis Lesson Learning Objectives Activities Assessment Risk Other emphasis Lesson 9 Further electrolysis calculations Calculate the amounts of the products of the electrolysis of molten salts and aqueous solutions. Starter – review gaseous moles from previous work Students carry out simple gaseous moles calculations as revision. Provide sample calculation for finding moles and volumes of gases produced in electrolysis Students carry out electrolysis calculations from the work sheet. Electrolysis work sheet Lesson 10 Test Spiritual, Moral and Ethical, Social, Cultural and Other issues Spiritual – students sense the natural, material and physical world they live in, reflecting on their part in it, exploring such questions as the patterns shown by the reactions of the different elements, and experiencing a sense of awe and wonder at the natural world. Moral and Ethical – students understand the need to draw conclusions using observation and evidence rather than preconception or prejudice, and through discussion of the implications of the uses of scientific knowledge, including the recognition that such uses can have both beneficial and harmful effects. Exploration of values and ethics relating to application of science and technology is possible. Lesson 3