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A level Physical Chemistry Key Definitions (Incomplete)
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- 1Acid dissociation constant, KaThe extent of acid dissociation.
Ka = {(conc.H+)(conc.A-)}/ (conc. HA) - 2Ionic product of water KwThe equilibrium constant for the dissociation of water into H+ and OH- ions.
- 3BufferMinimises changes in pH when diluted or when small ampounts of strong acid/ base are added.
- 4SaltIonic product formed when an acid reacts with a base and the H+ from the acid is replaced by another positive ion.
- 5MonoproticProduces one mole of H+ ions in solution.
- 6DiproticProduces two moles of H+ ions in solution.
- 7Weak AcidProton donor that partially dissociates into its ions.
- 8Weak BaseProton acceptor that partially dissociates into solution.
- 9Strong AcidProton Donor that completely dissociates into its ions.
- 10pHA measure of acidity according to the concentration of H+ ions in the solution.
- 11AmphotericCan act as both acid and base.
- 12AmphiproticCan both donate and accept a proton.
- 13Conjugate acid base pairA pair of species differing only by a single proton.
- 14AlkaliSoluble base which releases OH- ions in solution.
- 15Bronsted-Lowry AcidReleases H+ ions in solution
- 16Bronsted-lowry baseProton acceptor.
- 17Standard enthalpy change of reaction.The enthalpy change that accompanies a reaction in the molar quantities expressed in the balanced equation, under standard conditions.
- 18Standard enthalpy change of combustion.The enthalpy change that takes place when one mole of a compound is reacted completely with oxygen, under standard conditions.
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- All the key terms you will need to know for A level physical chemistry, and their definitons!
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- Irene Binil
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