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Sameer Biology
Jahabarali


Unit 5 Modul
e 2 Ener
gy







Lattice Enthalpy



Lattice enthalpy ( ) is the enthalpy change when one mole of an ionic compound is formed from its
gaseous ion under standard conditions. It is an exothermic reaction (hence the enthalpy change is negative),
which measures the…

Page 2

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Sameer Biology
Jahabarali


Unit 5 Modul
e 2 Ener
gy




Born Haber cycle is constructed by drawing:

Zero energy level- with all elements in their standard states (datum line)
Lowest energy level- with the ionic solid
Atomisation energy levels- with the element being atomised in gaseous form
Ionisation energy level-…

Page 3

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Sameer Biology
Jahabarali


Unit 5 Modul
e 2 Ener
gy




The tendency of a process to take place depends:

Temperature ( T)
Entropy change in the system ( S),
Enthalpy change( H)

Gibbs free energy change( G) is the balance between entropy and enthalpy changes which determines the
feasibility of…

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Sameer Biology
Jahabarali


Unit 5 Modul
e 2 Ener
gy




metals or non-metals in contact with their ions in aqueous solution
Ions of the same element in different oxidation states



The standard cell potential is the emf between the two half cells making up the
cell under standard condition.


The…

Page 5

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Sameer Biology
Jahabarali


Unit 5 Modul
e 2 Ener
gy





Hydrogen absorption within solid materials, through dissociation of H atoms which are
incorporated within a solid lattice as `hydrides'

Limitations of hydrogen fuel cells:

Large-scale storage and transportation, is cost and energy effective
Feasibility of storing pressurised liquid
Current absorbers…

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