Nota Terkini

Thursday, May 28, 2009

[Chemistry Form 4] Conductive

  • Conductors are substances that can conduct electricity in a solid or molten state, and are not chemically changed.

  • Electrolytes are substances that can conduct electricity either in a molten state or an aqueous solution, as well as undergo chemical changes at the same time.

  • Non-electrolytes are substances that cannot conduct electricity either in a molten state or an aqueous solution.

  • Electrolysis is the decomposition of a chemical compound into its constituent elements when an electric current passes through an electrolyte.

  • An electrolytic cell ia a device that uses electrical energy to generate chemical reactions.

  • Electrodes are conductors that transmit electricity through the electrolyte during electrolysis.

  • Cathode is the electrode that is connected to the negative terminal of a battery.

  • Anode is the electrode through which the electrons leave the electrolyte and move to the external circuit.

  • Molten compounds or aqueous solutions can conduct electricity due to the presence of free moving ions.

  • During electrolysis, cations move towards the cathode, where they will be discharged by accepting electrons, whereas anions move towards the anode, where they will be discharged by donating electrons.

  • A voltaic or galvanic cell is a device that converts chemical energy into electrical energy.

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