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Title: Entropy and Enthalpy (Lattice Enthalpy) (A2 Chemistry OCR)
Description: A useful guide and introduction to entropy and enthalpy (specifically lattice enthalpy) for students studying A2 Chemistry (OCR).
Description: A useful guide and introduction to entropy and enthalpy (specifically lattice enthalpy) for students studying A2 Chemistry (OCR).
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Entropy and Enthalpy
Entropy is measured using ΔS
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Entropy has the unit of Joules per Kelvin per mole
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This is because if they are at a lower energy
level they tend to be more comfortable
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A spontaneous change can only take place in one direction unless we put in work
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Both entropy and enthalpy balance each other out for example an ice cube melting is
spontaneous however it is endothermic, this is due to the entropy value
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This is called the Gibbs free energy
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Although if the ΔG value
is greater than 0 the reaction will not happen spontaneously at that temperature
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We compare the ions
2
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Check the ionic charge (greater charge means greater charge density)
4
Title: Entropy and Enthalpy (Lattice Enthalpy) (A2 Chemistry OCR)
Description: A useful guide and introduction to entropy and enthalpy (specifically lattice enthalpy) for students studying A2 Chemistry (OCR).
Description: A useful guide and introduction to entropy and enthalpy (specifically lattice enthalpy) for students studying A2 Chemistry (OCR).