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F325 Definitions
Acid ­ Base Pair A pair of two species that transform into each other by gain or loss of a proton.

Brønsted Lowry Acid A species that is a proton H+ donor.
Brønsted Lowry Base A species that is a proton H+ acceptor.
Buffer Solution A system that…

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Process can only be spontaneous when:
Half-Life The time taken for the concentration of a reactant to reduce by half.
Hess' Law If a reaction can take place by more than one route and the initial and final conditions are the
same, the total enthalpy change for both routes are…

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Second Electron Affinity The enthalpy change that accompanies the addition one electron to each atom in one mole of
gaseous atoms to form one mole of gaseous 2- atoms.
Second Ionisation Energy The energy to remove one electron from each atom in one mole of gaseous atoms to form one…

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