Electrolysis
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Last updated 7:27 AM on 7/8/22
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35 Terms
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Electrolyte
________: substance that conducts electricity when dissolved in water and is broken down by electrolysis.
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Anion
________: Negatively charged ion that moves to anode.
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Na+
________ and OH- ions are left in solution forming sodium hydroxide.
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Cation
________: Positively charged ion that moves to cathode.
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Brine
________: concentrated aqueous NaCl solution.
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→Reduction of positive cations
________ happens at the cathode.
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electrolysis aluminum
During ________ (Al3+ + 3e- → Al) is produced at the carbon cathode and oxygen (2O2-- 4e- → O2) at the carbon anode.
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metal ions
Positively charged H+ and ________ are attracted to the negative electrode but only one will gain electrons.
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metal
If the ________ is above hydrogen in the reactivity series, then hydrogen will be produced and bubbling will be seen at the cathode.
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Electrolysis
________: The breakdown of an electrolyte (ionic compound, molten or aqueous solution) by passing an electric current.
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OH
Negatively charged ________- ions and non- metal ions are attracted to the positive electrode.
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halide solution
If a dilute ________ is being electrolysed, oxygen is formed.
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Electrodes
________: Metal or graphite rods that aid the flow of electricity in and out of the electrolyte.
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Non metal ions
________ (other than hydrogen) are attracted to the positive electrode.
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halide ions
If no ________ are present, then OH- is discharged at the anode, gains electrons and forms oxygen gas.
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reactive ion
The product formed depends on which ion loses electrons more readily, with the more ________ remaining in solution.
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metal
If the ________ is above hydrogen in reactivity series, then hydrogen will be produced and bubbling will be seen at the cathode.
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Electrolysis
The breakdown of an electrolyte (ionic compound, molten or aqueous solution) by passing an electric current
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Electrodes
Metal or graphite rods that aid the flow of electricity in and out of the electrolyte
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Anode
Positive electrode
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Cathode
Negative Electrode
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Anion
Negatively charged ion that moves to anode
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Cation
Positively charged ion that moves to cathode
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Electrolyte
substance that conducts electricity when dissolved in water and is broken down by electrolysis
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Electroplating
The process of coating the surface of a metal (more reactive) with another metal (less reactive) using electrolysis
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Cathode
thin strip of pure metal
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Anode
impure metal
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Electrolyte
Aqueous Salt Solution of metal
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The refining of copper
Impure copper as the anode and pure copper as the cathode; the aqueous copper (II) sulfate helps the copper ions move from the anode to the cathode
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Reaction at Cathode
Cu2+ + 2e Cu (mass increases)
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The main ore of aluminum is bauxite
high m.p
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Aluminum (III) oxide (alumina) is dissolved in molten cryolite (Na3AlF6)
this mixture has a lower m.p
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Brine
concentrated aqueous NaCl solution
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Ions present
Na+, H+, Cl- and OH-
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Na+ and OH
ions are left in solution forming sodium hydroxide
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