BRAINCAKEEntropy
Revision notes for Entropy in OCR Chemistry A (H432). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- EntropyEntropy is a measure of the level of disorder in a system.
- The Second Law of ThermodynamicsThe second law of thermodynamic states that spontaneous changes result in an increase in disorder or entropy.
- The Entropy Change of a SystemThe entropy change of a system is given by ΔSθsystem = ΣSθproducts - ΣSθreactants The entropy change in a system is the difference between the sum…
- The Effect of Temperature on EntropyAll substances have some degree of disorder because the particles are always in constant motion.
- The Entropy Change of the SurroundingsThe total entropy change ΔStotal is the sum of the entropy changes of the system and of the surroundings.
- Spontaneous Reactions and Gibbs Free EnergyChanges are thermodynamically feasible if the total entropy change is positive, so for an endothermic reaction, if an increase in entropy is more…