Learning Objectives By the end of the lesson I will be able to: 1) Understand the process of electrolysis. 2) Explain how we can use electrolysis to splitting water to produce hydrogen. Match up the words with their descriptions Anode
The substance being broken down Positive electrode Makes a popping noise when lit Splitting a substance using electricity Cathode
Relights a glowing splint Test for Oxygen Test for Hydrogen Electrolyte Anion Negative electrode
Cation Positive ion Electrolysis Negative ion Electrolysis is splitting up substances using electricity (Lysis is latin for splitting)
What is electrolysis? Electric current is used to breakdown a substance made up of ions An electrolyte is the name for the substance being broken down Dont get stressed in the exam: Remember PANIC
Positive Anode Negative Is Cathode Electrolysis Apparatus Electrolyte: this is what will be electrolysed
Anode (+ve electrode) Cathode (-ve electrode) power supply THE ELECTROLYSIS OF WATER The unique way in
which the hydrogen atoms are attached to the oxygen atom causes the hydrogen side of the molecule to have a positive charge and the oxygen side to have a negative charge. The + Hydrogen atoms are attracted
to the - charged terminal, and are pulled off the H2O molecule, filling the right tube in this diagram with Hydrogen gas. The - Oxygen atoms are attracted to the
+ charged terminal, and are pulled from the H2O molecule, filling the left tube in this diagram with Oxygen gas. H2O consists of 2 H atoms and 1 O atom so twice as much
Hydrogen gas will be produced Chemical what Happens Anode (positive): Cathode (negative): OVERALL: 2H2O O2+4H++4e4H++4e-2H2 2H2O O2+2H2
Electrolysis of Water http://www.youtube.com/watch?v=VnYSw 349qvM True or False Electrolysis is the splitting of a substance using electricity. The anode is negative. Anions are negative Cathode is negative. Cations are negative.
REDUCTION happens here ( positive ions gain electrons) OXIDATION happens here (negative ions lose electrons Uses of
Electrolysis Electro-repairing Electrolysis can be used to repair broken machinery. CRACKED MACHINERY WAX The whole of the broken object is coated in wax, all except the broken
part. e- e- e- e- Cathode
Anode A pure metal is used as the anode. A suitable electrolyte The cracked object is made the cathode
e- e- Anode (Oxidation) e- e-
Cathode (Reduction) h The metal atoms on the anode become oxidised to positive ions (cations), (their electrons are stolen) these cations move through the electrolyte to the cathode. As the crack is the only part exposed, this is filled with the metal ions which become reduced; gaining an electron and so metal atoms are deposited. After some time the object is removed from the electrolytic bath,
washed and the excess metal is removed by machining the repaired article to its proper size. d o Go ! w e
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