Entropy (AQA A-Level Chemistry): Quizzes

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Entropy
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What does entropy (SS) measure in a system?

Disorder or randomness

What are the units for standard entropy (S∘S^\circ)?

JK−1mol−1J K^{-1} mol^{-1}

Why is enthalpy (ΔH\Delta H) alone insufficient to predict if a reaction will occur spontaneously?

Entropy changes also affect feasibility

Which physical state has the highest entropy?

Gas

Which physical state has the lowest entropy?

Solid

What happens to entropy when a solid dissolves?

It increases

How does producing more moles of gas in a reaction affect entropy?

Increases entropy

What is the standard entropy of a perfect crystal at 0 K?

Zero

How does increasing temperature affect entropy?

Entropy increases

What is the formula for calculating entropy change (ΔS\Delta S) in a reaction?

∑Sproducts∘−∑Sreactants∘\sum S^\circ_{\text{products}} - \sum S^\circ_{\text{reactants}}

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