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Enthalpy and entropy

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Question 6

The thermodynamic feasibility of a chemical reaction depends on the temperature and the signs of enthalpy change, ΔH\Delta HΔH, and entropy change, ΔS\Delta SΔS.

Which of the following lists the signs of ΔH \Delta H\,ΔH and ΔS \Delta S\,ΔS for a reaction that is feasible at low temperatures but is not feasible at high temperatures?

A

ΔH=+\Delta H = +ΔH=+, ΔS=+\Delta S = +ΔS=+

B

ΔH=+\Delta H = +ΔH=+, ΔS=−\Delta S = -ΔS=−

C

ΔH=−\Delta H = -ΔH=−, ΔS=+\Delta S = +ΔS=+

D

ΔH=−\Delta H = -ΔH=−, ΔS=−\Delta S = -ΔS=−

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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