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Enthalpy and entropy

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Question 2

Reusable hand warmers contain a supersaturated solution of sodium acetate. When a metal disc inside the hand warmer is clicked, crystallization is initiated, releasing thermal energy to the surroundings as solid sodium acetate trihydrate forms.

What are the signs of the enthalpy change (ΔH\Delta HΔH) and the entropy change of the system (ΔS\Delta SΔS) for this crystallization process?

A

ΔH\Delta HΔH is positive and ΔS\Delta SΔS is positive

B

ΔH\Delta HΔH is positive and ΔS\Delta SΔS is negative

C

ΔH\Delta HΔH is negative and ΔS\Delta SΔS is positive

D

ΔH\Delta HΔH is negative and ΔS\Delta SΔS is negative

Markscheme

Enthalpy and entropy Questions

  1. A Level
  2. /Chemistry
  3. /Enthalpy and entropy

24 exam-style questions on OCR A A Level Chemistry Enthalpy and entropy. Each one has a worked solution and a mark scheme showing where the marks go.

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