DM(e) the action of an electrochemical Displacement reactions between cell in of half-equations and metals and their salts (Nuffield external electron flow and the ion flow Foundation) in the salt bridge The familiar concept of displacement reactions and the prediction of the result of such a reaction using the reactivity series lay the foundation for a deep understanding of the electrochemical series and the nature of electrode potentials. This short practical reviews these concepts ready to develop the learners’ ideas. THINKING CONCEPTUALLY DM(f) the term standard electrode The ammonium dichromate(VI) potential and its measurement a volcano (Nuffield Foundation) hydrogen electrode; use of standard This is a great teacher demonstration that electrode potentials to: shows how strongly oxidising Cr2O72– (i) calculate ions produce nitrogen and water from the (ii) predict the feasibility of ammonium ions. The brightly coloured reactions, and the reasons why a orange chromate(VI) ions are reduced to reaction may not occur produce a mass of green chromium(III) (iii) explain rusting, and its prevention, oxide, which can be saved and used in in terms of electrochemical processes the oxidation of ammonia demonstration later. THINKING CONCEPTUALLY DM(g) transition metals as d-block Reduction of vanadium compounds by elements forming one or more stable zinc (Royal Society of Chemistry) ions which have incompletely filled A very colourful activity that works well as a plenary to the section on colour as well
DM(e) the action of an electrochemical cell in of half-equations and external electron flow and the ion flow in the salt bridge Displacement reactions between metals and their salts (Nuffield Foundation) The familiar concept of displacement reactions and the prediction of the result of such a reaction using the reactivity series lay the foundation for a deep understanding of the electrochemical series and the nature of electrode potentials. This short practical reviews these concepts ready to develop the learners’ ideas. THINKING CONCEPTUALLY DM(f) the term standard electrode potential and its measurement a hydrogen electrode; use of standard electrode potentials to: (i) calculate (ii) predict the feasibility of reactions, and the reasons why a reaction may not occur (iii) explain rusting, and its prevention, in terms of electrochemical processes The ammonium dichromate(VI) volcano (Nuffield Foundation) This is a great teacher demonstration that shows how strongly oxidising Cr2O72– ions produce nitrogen and water from the ammonium ions. The brightly coloured orange chromate(VI) ions are reduced to produce a mass of green chromium(III) oxide, which can be saved and used in the oxidation of ammonia demonstration later. THINKING CONCEPTUALLY DM(g) transition metals as d-block elements forming one or more stable ions which have incompletely filled Reduction of vanadium compounds by zinc (Royal Society of Chemistry) A very colourful activity that works well as a plenary to the section on colour as well
Chemistry%20B%20Resources%2011-11-16.docx