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Date May 2011 Marks available 1 Reference code 11M.1.hl.TZ2.19
Level HL Paper 1 Time zone TZ2
Command term Identify Question number 19 Adapted from N/A

Question

\(\Delta {G^\Theta }\) calculations predict that a reaction is always spontaneous for which of the following combinations of \(\Delta {H^\Theta }\) and \(\Delta {S^\Theta }\)?

A.     \( + \Delta {H^\Theta }\) and \( + \Delta {S^\Theta }\)

B.     \( + \Delta {H^\Theta }\) and \( - \Delta {S^\Theta }\)

C.     \( - \Delta {H^\Theta }\) and \( - \Delta {S^\Theta }\)

D.     \( - \Delta {H^\Theta }\) and \( + \Delta {S^\Theta }\)

Markscheme

D

Examiners report

There were eight G2 comments on this question. Most stated that a table would have been better for the presentation of the four possible combinations which is a reasonable suggestion.

Syllabus sections

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