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Date May 2013 Marks available 1 Reference code 13M.1.hl.TZ2.17
Level HL Paper 1 Time zone TZ2
Command term Determine Question number 17 Adapted from N/A

Question

Which reactions/processes have a positive entropy change, \(\Delta {S^\Theta }\)?

I.     \({\text{NaCl(s)}} \to {\text{NaCl(aq)}}\)

II.     \({\text{N}}{{\text{a}}_2}{\text{C}}{{\text{O}}_3}{\text{(s)}} + {\text{2HCl(aq)}} \to {\text{C}}{{\text{O}}_2}{\text{(g)}} + {\text{2NaCl(aq)}} + {{\text{H}}_2}{\text{O(l)}}\)

III.     \({\text{AgN}}{{\text{O}}_3}{\text{(aq)}} + {\text{NaCl(aq)}} \to {\text{AgCl(s)}} + {\text{NaN}}{{\text{O}}_3}{\text{(aq)}}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

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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