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Date May 2018 Marks available 1 Reference code 18M.1.hl.TZ1.17
Level HL Paper 1 Time zone TZ1
Command term Identify Question number 17 Adapted from N/A

Question

Which statement is correct?

A.     If ΔH < 0, reaction is always spontaneous.

B.     If ΔH > 0, reaction is never spontaneous.

C.     If ΔS < 0, reaction can be spontaneous if temperature is low enough.

D.     If ΔS < 0, reaction can be spontaneous if temperature is high enough.

Markscheme

C

Examiners report

[N/A]

Syllabus sections

Additional higher level (AHL) » Topic 15: Energetics/thermochemistry » 15.2 Entropy and spontaneity
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