Chemistry — Electrolysis
Redox at the cathode and anode.
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digraph Electrolysis {
rankdir=LR;
node [shape=box, style=rounded];
"Power supply" -> "Cathode (-)" [label="electrons in"];
"Power supply" -> "Anode (+)" [label="electrons out"];
"Cathode (-)" -> "Cations reduced" [label="gain electrons"];
"Anode (+)" -> "Anions oxidised" [label="lose electrons"];
"Cations reduced" -> "Metal or hydrogen";
"Anions oxidised" -> "Non-metal or oxygen";
}