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Entropy is one of the most important concepts of thermodynamics. It
considers the importance of random behaviour as a driving force behind
all physical and chemical change.
This chapter examines disorder in particular systems and how increased
disorder leads to greater stability.
Syllabus reference
Reactivity 1.4.1 - Entropy, S, is a measure of the dispersal or distribution of matter and/or energy in a system. (HL)
- The more ways the energy can be distributed, the higher the entropy. Under the same
conditions, the entropy of a gas is greater than that of a liquid, which in turn is greater than that of a
solid.
- Predict whether a physical or chemical change will result in an increase or decrease in entropy of a system
- Calculate standard entropy changes, ΔS⦵, from standard entropy values, S⦵.
Guidance
- Standard entropy values are given in the data booklet.
Tools and links
- Structure 1.1 - Why is the entropy of a perfect crystal at 0 K predicted to be zero?
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