These are put into categories based on commonly tested writing topics. If you wonder how you can construct a sentence with these, consider these: (i) It’s been said that “…” , … (ii) The old saying of “…” , … (iii) As the saying / adage goes, “…” i.e. The common saying of “The greatest…
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Electrolysis – How Hydrogen and Oxygen Create Clean energy (PEM Fuel Cell)
I find this animation particularly useful to help students visualise the oxidative and reductive reactions happening at the anode and cathode respectively. A Proton Exchange Membrane(PEM) cell uses a specially treated membrane/electrolyte that divides the two electrodes and blocks electrons from passing directly through it, forcing them to instead flow through the external circuit set…