F325

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Author:
jjeffery
ID:
275147
Filename:
F325
Updated:
2014-05-23 05:38:16
Tags:
Equilibria energetics elements
Folders:
Chemistry
Description:
OCR A2 chemistry
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  1. Describe a redox reaction, the changes in oxidation number and the reagents present.
    A redox reaction is a reaction in which both oxidation and reduction take place. When a chemical is reduced its oxidation number decreases and when a chemical is oxidised its oxidation number increases. An oxidising reagent accepts electrons and is reduced. A reducing agent is the opposite.
  2. Define standard electrode potential
    The electromotive force of a half cell compared with a standard hydrogen half cell, measured at 298K, with 1 moldm-3 solution concentrations at 100 kpa pressure
  3. Define Standard Lattice enthalpy
    the enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions
  4. Define Enthalpy change of formation
    the enthalpy change that takes place when one mole of a compound is formed from its constituent elements in their standard states under standard conditions
  5. Define enthalpy change of atomisation
    the enthalpy change that takes place when one mole of gaseous atoms forms from the element in its standard state
  6. Define First ionisation energy
    the energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions
  7. Define second ionisation energy
    the energy required to remove one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions

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