Electrochemistry
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Define electrolysis.
decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current
What is the anode?
the positive electrode
What is the cathode?
the negative electron
What is the electrolyte?
the molten or aqueous substance that undergoes electrolysis
What are formed at the cathode?
metals or hydrogen
What are formed at the anode?
non-metals (except hydrogen)
What process occurs at the anode?
oxidation
What process occurs at the cathode?
reduction
Why are metal objects electroplated?
to improve their appearance and resistance to corrosion
What process makes metal objects more resistant to corrosion and with improved appearance?
electroplating
What does a hydrogen–oxygen fuel cell do?
uses hydrogen and oxygen to produce electricity with water as the only chemical product
Electrolysis of MOLTEN LEAD(II) BROMIDE: product at the anode
bromine
Electrolysis of MOLTEN LEAD(II) BROMIDE: product at the cathode
lead
Electrolysis of MOLTEN LEAD(II) BROMIDE: observations
cathode: silvery solid anode: brown gas
Electrolysis of concentrated aqueous NaCl: product at the anode
chlorine
Electrolysis of concentrated aqueous NaCl: product at the cathode
hydrogen
Electrolysis of concentrated aqueous NaCl: observations
cathode: colourless gas, lit splint squeaky pop anode: pale yellow-green gas (turns UI red and bleaches red litmus)
Electrolysis of dilute sulfuric acid: product at the anode
oxygen
Electrolysis of dilute sulfuric acid: product at the cathode
hydrogen
Electrolysis of dilute sulfuric acid: observations
anode: colourless gas, relights glowing splint cathode: colourless gas, lit splint squeaky pop