2022-04-25T20:09:49+03:00[Europe/Moscow] en true <p>Electrolysis</p>, <p>Electric current</p>, <p>Electrolyte</p>, <p>Electrodes</p>, <p>Anode</p>, <p>Cathode</p>, <p>Positive ions</p>, <p>Negative ions</p>, <p>Inert conductor</p>, <p>Brine</p>, <p>Electrolysis of brine produces...</p>, <p>Brine is electrolysed in...</p>, <p>At the anode...</p>, <p>At the cathode...</p>, <p>Oxidation</p>, <p>Reduction</p>, <p>Half-equations</p>, <p>Define reduction?</p>, <p>What is an electrolyte?</p>, <p>Define molten?</p>, <p>Define molten?</p><p>melted by heat</p><p>During electrolysis what do you understand by the term 'discharge'?</p>, <p>inert substance is ........</p>, <p>non-electrolytes are ......</p>, <p>What are electrodes?</p>, <p>What is electroplating?</p>, <p>Which cation (metal or hydrogen) gets discharged during electrolysis of an aqueous solution?</p>, <p>Which anion (OH- or halide) gets discharged during electrolysis of an aqueous solution?</p>, <p>What forms at the cathode?</p>, <p>what forms at the anode</p>, <p>what is brine</p>, <p>what is brine</p>, <p>To which electrodes do the lead and bromide ions go during the electrolysis of PbBr2</p>, <p>Does oxidation occur at the anode or cathode?</p>, <p>Does reduction occur at the anode or cathode?</p>, <p>Why is a mixture of aluminium oxide and cryolite used, rather than aluminium oxide alone?</p>, <p>Why during the extraction of aluminium from aluminium oxide, do the anodes need to be replaced during ?</p>, <p>Give 2 uses for chlorine</p>, <p>Give 2 uses for sodium hydroxide</p> flashcards
Electrolysis

Electrolysis

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  • Electrolysis

    The breaking down of an ionic compound when molten or in an aqueous solution by the passage of electricity

  • Electric current

    Causes a chemical reaction that breaks down the ionic compound.

  • Electrolyte

    The compound that conducts electricity when molten and breaks down during electrolysis.

  • Electrodes

    Rods that carry electric current to and from the electrolyte.

  • Anode

    Positive electrode.

  • Cathode

    Negative electrode.

  • Positive ions

    Form at the cathode.

  • Negative ions

    Form at the anode

  • Inert conductor

    Unreactive conductor that won't interfere with the electrolysis.

  • Brine

    Concentrated aqueous solution of sodium chloride, obtained from seams of rock salt underground.

  • Electrolysis of brine produces...

    Chlorine, hydrogen, sodium hydroxide.

  • Brine is electrolysed in...

    A diaphragm cell.

  • At the anode...

    Ions lose electrons.

  • At the cathode...

    Ions gain electrons.

  • Oxidation

    Reaction with loss of electrons

  • Reduction

    Reaction with gain of electrons.

  • Half-equations

    Ionic equations that only show what is happening at only one of the electrodes.

  • Define reduction?

    Gain of electrons

  • What is an electrolyte?

    Liquids that are good conductors of electricity

  • Define molten?

    melted by heat

  • Define molten?

    melted by heat

    During electrolysis what do you understand by the term 'discharge'?

    lose its charge, become neutral

  • inert substance is ........

    unreactive

  • non-electrolytes are ......

    Liquids that do not conduct electricity

  • What are electrodes?

    A graphite (inert) or metal strip that conducts electricity

  • What is electroplating?

    An electrolytic process in which metal ions are reduced and the metal atoms are deposited on a surface

  • Which cation (metal or hydrogen) gets discharged during electrolysis of an aqueous solution?

    the least reactive

  • Which anion (OH- or halide) gets discharged during electrolysis of an aqueous solution?

    usually the halide ion (unless very dilute)

  • What forms at the cathode?

    either a metal or hydrogen

  • what forms at the anode

    a non metal other than hydrogen

  • what is brine

    Concentrated sodium chloride solution

  • what is brine

    Concentrated sodium chloride solution

  • To which electrodes do the lead and bromide ions go during the electrolysis of PbBr2

    Lead is positively charged and moves to the negative electrode (cathode).Bromine is negatively charged and move to the positive electrode (anode).

  • Does oxidation occur at the anode or cathode?

    Oxidation occurs at the anode. Oxidation is the loss of electrons

  • Does reduction occur at the anode or cathode?

    Reduction occurs at the cathode. Reduction is the gain of electrons.

  • Why is a mixture of aluminium oxide and cryolite used, rather than aluminium oxide alone?

    Cryolite lowers the melting point and reduces some of the energy costs involved in extracting aluminium oxide.

  • Why during the extraction of aluminium from aluminium oxide, do the anodes need to be replaced during ?

    Since the positive electrodes are made of carbon they get corroded by the oxygen forming carbon dioxide and so must be replaced every few weeks

  • Give 2 uses for chlorine

    Kills harmful bacteria in swimming poolsTo sterelise the domestic water supplyTo manafacture PVC

  • Give 2 uses for sodium hydroxide

    Used to make soapManufacture bleach (with chlorine)