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28 Cards in this Set
- Front
- Back
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Symbol for lead (II) Bromide
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PbBr2
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When does the lead (II) Bromide begin behaving as an electrolyte
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When it is heated to a molten state.
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Chemical Equation of lead (II) Bromide
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Lead (ii) Bromide (l) - - - > Bromide + Lead
PbBr2 (l) - - - > Br2 (g) + Pb (l) |
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The half equation that occurs at the Cathode in the electrolysis of Lead (ii) Bromide
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Lead ion + electrons - - - > lead atom
Pb^+2(l) + 2e - - - > Pb (l) |
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Reduction
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The process of losing oxygen or gaining electrons
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The half equation that occurs at the Anode in the electrolysis of Lead (ii) Bromide
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Oxygen had Br^- (l) - - electrolysis - > Br + e
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The products of the electrolysis of Lead (ii) Bromide (qualitatively)
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Oxygen Molten lead and orange bromine vapour
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General principal of products from electrolysis
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Metals and Hydrogen form at the Cathode
Non metals form at the Anode |
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Why is pure aluminium so rare?
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It is very reactive
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The Hall Heroult process
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Bauxite is treated to improve conductivity. The aluminium oxide is then dissolved in molten cryolite, to reduce the energy needed for electrolysis. The mixture is then electrolysed.
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Half equation that occurs at the Anode of the electrolysis of Aluminium Oxide
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Oxide Ions - - - > oxygen molecules + electrons
2O^-2 - - - > O2 (g) + 4e |
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Half equation that occurs at the Cathode of the electrolysis of Aluminium Oxide
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Aluminium Ions + electrons - - - > aluminium metal
Al^3 + 3e - - - > Al |
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The products of the electrolysis of Aluminium Oxide (qualitatively)
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Oxygen gas and aluminium metal.
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What sometimes happens during the electrolysis of Aluminium Oxide
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The liberated air reacts with the graphite anodes producing CO2
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Chemical Equation of Aluminium Oxide
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Aluminium Oxide - -electrolysis - > aluminium + oxygen
2Al2O3 - - - > 4Al + 3O2 |
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How can water be electrolysed
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a Hofmann Voltameter and some dilute sulfuric acid can be used to decompose water.
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Half equation that occurs at the Anode of the electrolysis of Water
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Hydroxide ions ---> water + oxygen + electrons
4OH- (aq) ---> 2H2O(l) + O2 + 4e |
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Half equation that occurs at the Cathode of the electrolysis of Water
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Hydrogen ions + 4e ---> 2H2
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The products of the electrolysis of concentrated sodium chloride (qualitatively)
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Chlorine gas, Hydrogen gas and a solution of sodium hydroxide.
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Half equation that occurs at the Cathode of the electrolysis of Concentrated sodium chloride
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Sodium ions + electrons ---> sodium metal
Na^+(l) + e ---> Na(l) |
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Half equation that occurs at the Anode of the electrolysis of Concentrated sodium chloride
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Chlorine ions ---> electrons + chlorine gas
2Cl^- (l) ---> Cl2 + 2e |
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The chemical equation of the electrolysis of Sodium Chloride
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Sodium Chloride ---> sodium + chloride
2NaCl (l) ---> 2Na + Cl2 |
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Carbon Electrodes are used for the electrolysis of
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Lead (II) Bromide
Aluminium Oxide |
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Platinum Electrodes are used for the electrolysis of
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Water
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The products of the electrolysis of aqueous copper (II) sulphate using inert electrodes (qualitatively)
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Copper and Oxygen
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Half equation that occurs at the Cathode of the electrolysis of aqueous copper (II) sulphate
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Copper ions + electrons ---> copper
Cu^+2 (aq) + 2e ---> Cu(s) |
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Half equation that occurs at the Anode of the electrolysis of aqueous copper (II) sulphate
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Hydroxide Ions ---> oxygen + water electrons
4OH^- ---> O2 + 2H2O + 4e |
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Chemical Equation of the electrolysis of aqueous copper (II) sulphate
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????? |
