Enthalpy, entropy and free energy
- Created by: saralycett
- Created on: 25-05-17 09:26
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- Enthalpy, entropy and free energy
- Lattice enthalpy: is the energy released when 1 mole of ionic compound is formed from its constituent ions in their gaseous state
- Affected by ionic charge, radii and polarisation of ions
- Polarisation: the distortion of the electron cloud in a molecule or ion by a nearby positive charge
- Affected by ionic charge, radii and polarisation of ions
- Enthalpy change of atomisation: the enthalpy change when 1 mole of gaseous atoms is formed from the element in its standard state
- Electron affinity: the enthalpy change accompanying the gain of 1 mole of electrons by 1 mole of gaseous atoms
- Enthalpy change of formation: enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states
- Enthalpy change of hydration: enthalpy change that occurs when 1 mole of a gaseous ion is completely hydrated by water
- Enthalpy change of solution: the enthalpy change that occurs when 1 mole of an ionic solid dissolves in water
- Entropy: a measure of disorder
- ?S total=?S system +?S surroundings
- ?S= Entropy of products- entropy of reactants
- Gibbs free energy equation
- ?G=?H-T?S
- Lattice enthalpy: is the energy released when 1 mole of ionic compound is formed from its constituent ions in their gaseous state
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