1.8 Thermodynamics Flashcards
Enthalpy of formation
energy change for formation of 1 mole of a substance from its constituents under standard states and conditions
Enthalpy of combustion
energy change for combustion of 1 mole of a substance into its oxides under standard states and conditions
Enthalpy of atomisation
energy change for 1 mole of gaseous atoms to be formed from its elements under standard states
Enthalpy of first ionisation
energy change to remove 1 election form each atom in the 1 mole of gaseous atoms to form 1 mole of gases ions
Enthalpy of electron affinity
energy change when 1 mole of gaseous atoms are converted to 2 mole of gaseous 1- ions to due addition of one mole of electrons
Enthalpy of lattice formation
energy change wen 1 mole of solid ionic compound is formed from its gaseous ions
Enthalpy of hydration
energy change when water molecules surround 1 mole of gaseous ions
Enthalpy of solution
energy change when 1 mole of solute dissolves completely in sufficient solvent to form a solution in which the molecules of ions are far enough apart to not interact
Entropy ∆Sø
measure of disorder of a chemical system
How to calculate Entropy
∆Sø = ∑S Products- ∑S reactants
What is Gibbs Free energy?
A balance between entropy and enthalpy
∆G = ∆H - T * ∆S
Why will a reaction not occur
a reaction will not occur is it has a large Ea or it is not feasible
When will a reaction be feasible?
∆G ≤ 0
At equilibrium ∆G= 0
What is the Born Hater Cycle?
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What is a solution Cycle?
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