What is entropy a measure of?

Entropy is a measure of the degree of disorder or randomness in a system.


It quantifies the number of ways particles can be arranged and how energy is distributed among those particles.

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What is the relationship between disorder in a system and its entropy value?

Systems that are more disordered have higher entropy values.

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Which letter is conventionally used to represent entropy?

S

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What is the standard unit of measurement for entropy?

J K-1 mol-1

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Which state of matter (solids, liquids or gases) typically has the highest entropy?

Gases typically have the highest entropy, followed by liquids and solids.

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Explain the entropy change that occurs when the number of gaseous molecules in a reaction increases.

When the number of gaseous molecules in a reaction increases, the entropy increases.


This is because with more gas molecules, there are more possible arrangements and distributions of energy that the molecules can take.

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What is the equation that links the entropy change of a reaction (ΔS) to the standard entropy changes of the reactants and products?

ΔS = Sproducts - Sreactants

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Predict and explain the change in entropy during the freezing of a liquid.

When a liquid freezes, entropy decreases because the particles in the solid state become more ordered and less random compared to the liquid state.

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What is meant by the term standard entropy (S⦵)?

Standard entropy is the entropy of one mole of a substance under standard conditions (of 100 kPa and 298 K).


Standard entropies are always positive.

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