Redox, electrochemistry, transition elements, Hydrogen-oxygen fuel cells
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Give three different properties of transition metals which are not typical of other metals
(good) catalysts; variable oxidation numbers; form coloured compounds / coloured ions
Transition metal physical properties
They are lustrous They are hard and strong They conduct heat and electricity
Electrons are supplied
From battery / power supply / cell; [1 mark] From negative electrode of battery to external circuit OR From iodide ion losing electron OR Oxidation of anion; [1 mark]
Examples of inert electrode
graphite or platinum
At which electrode does oxidation occur? Explain your choice.
anode/negative electrode and electrons lost(by hydrogen/H/H2)/electrons move from this electrode
OH- equation
1) 4OH -> O2 + H2O + 4e- 2) OH- into oxygen and water
Molten potassium bromide give the products of electrolysis
Anode = Bromide Cathode = Potassium
Define electrolysis
Breaking down of an ionic compound when molten or in aqueous solution Using electricity
Define oxidation in terms of electron transfer
Electron loss
What is the role of cryolite in aluminium extraction?
Lowers the melting point of electrolyte Acts as a solvent to improve conductivity