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Date May 2013 Marks available 1 Reference code 13M.1.hl.TZ1.17
Level HL Paper 1 Time zone TZ1
Command term Deduce Question number 17 Adapted from N/A

Question

Which process would be expected to have a \(\Delta {S^\Theta }\) value which is negative?

A.     \({\text{2}}{{\text{H}}_2}{\text{(g)}} + {{\text{O}}_2}{\text{(g)}} \to {\text{2}}{{\text{H}}_2}{\text{O(g)}}\)

B.     \({\text{NaCl(s)}} \to {\text{N}}{{\text{a}}^ + }{\text{(g)}} + {\text{C}}{{\text{l}}^ - }{\text{(g)}}\)

C.     \({{\text{H}}_2}{\text{(g)}} + {{\text{I}}_2}{\text{(g)}} \to {\text{2HI(g)}}\)

D.     \({\text{O}}{{\text{F}}_2}{\text{(g)}} + {{\text{H}}_2}{\text{O(g)}} \to {{\text{O}}_2}{\text{(g)}} + {\text{2HF(g)}}\)

Markscheme

A

Examiners report

[N/A]

Syllabus sections

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