Electrolysis help

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Princessrosh
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Someone please explain electrolysis and fuel cells to me.. can someone please just break down topic 5 to me
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Princessrosh
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I do aqa chemistry triple/separate
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eli7654
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(Original post by Princessrosh)
Someone please explain electrolysis and fuel cells to me.. can someone please just break down topic 5 to me
electrolysis is when you want to separate substances in a compound, for example, if you compound is magnesium sulphate, and you want to get magnesium and sulphur by themselves. Electrolysis is used only when the compound is ABOVE carbon on the reactivity series, because if it was below, you would be able to extract the element by displacing it with carbon, for example if you have iron oxide, and you want just the iron, carbon will displace the iron giving you carbon dioxide and iron. In an ionic compound, you always have charged particles. When you pass an electric current through the cathode and the anode (the electrodes) the positive ions in the compound will be attracted to the negative electrode (the cathode), whilst the negative ions will be attracted to the positive electrode, the anode.
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Phoenix181
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Can you say what topic 5 is?

Electrolysis is when you dissolve an ionic compound in water and then you place two metal rods called electrodes in the solution and pass a current through it. One electrode will be positively charged and is called the anode. The other will be negatively charged and is called the cathode.
Because during ionic bonding, metals give their electrons away, they lose negative charges (the electrons) and become positively charged and will be attracted to the cathode. And because non metals gain electrons, they become negatively charged and are attracted to the anode.
The non metals give their spare electrons (the ones they got from the metals) to the electric current and the electrons flow around the current to the metals where the electrons are returned to the metals.
Basically reverse ionic bonding
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Phoenix181
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And fuel cells like batteries?
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eli7654
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(Original post by Princessrosh)
Someone please explain electrolysis and fuel cells to me.. can someone please just break down topic 5 to me
another important point to note is that the actual ionic
compound needs to be MOLTEN or in a solution, because only then will the ions be able to move around freely and conduct their charges, thereby allowing them to be attracted to each electrode.
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Phoenix181
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IDK if you need to know this about electrolysis cause I do IGCSE higher triple but:

If halide ions are present, oxygen forms at the anode (instead of the non metal)
If the metal at the cathode is more reactive than hydrogen then hydrogen is formed
If you do electrolysis with just water, hydroxide ions form (that's OH-)
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