ENTROPY A LEVEL CHEMISTRY NOTES

These are a powerpoint presentation on chemistry A level notes on entropy.

The notes have been well written to help students and teachers undertaking chemistry a levels in edexcel IB and cambridge based syllabuses.

What is Entropy
Comparing entropy values
Predicting entropy change
Predicting sign of entropy
Calculating entropy change of a reaction

Spontaneous and non-spontaneous reaction
Calculating the entropy change of the system
Calculating the entropy change of the surroundings
Calculating total entropy change
ROLE OF TEMPERATURE
Why water freeze at -5 but does not at -5
More Entropy changes
Dissolving substances in water
SOLUBILITY OF GROUP 2 SULPHATES AND HYDROXIDES
Lattice energy and born Haber cycles
lattice energy
construct Born–Haber cycles
enthalpy change of atomisation and electron aff inity
eff ect of ionic charge and ionic radius on the numerical magnitude of a lattice energy
■■ interpret and explain qualitatively the trend in the thermal stability of the nitrates and carbonates of Group 2 elements in terms of the charge density of the cation and the polarisability of the large anion.

apply Hess’s law to construct energy cycles to determine enthalpy changes of solution and enthalpy changes of hydration.
■■ interpret and explain qualitatively the variation in solubility of Group 2 sulfates in terms of the relative values of the enthalpy change of hydration and the corresponding lattice energy.