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Date May 2011 Marks available 1 Reference code 11M.1.sl.TZ2.15
Level SL Paper 1 Time zone TZ2
Command term Identify Question number 15 Adapted from N/A

Question

Which processes have a negative enthalpy change?

I.     \(2{\text{C}}{{\text{H}}_3}{\text{OH(l)}} + 3{{\text{O}}_2}({\text{g)}} \to {\text{2C}}{{\text{O}}_2}({\text{g)}} + 4{{\text{H}}_2}{\text{O(l)}}\)

II.     \({\text{HCl(aq)}} + {\text{NaOH(aq)}} \to {\text{NaCl(aq)}} + {{\text{H}}_2}{\text{O(l)}}\)

III.     \({{\text{H}}_2}{\text{O(g)}} \to {{\text{H}}_2}{\text{O(l)}}\)

A.     I and II only

B.     I and III only

C.     II and III only

D.     I, II and III

Markscheme

D

Examiners report

[N/A]

Syllabus sections

Core » Topic 5: Energetics/thermochemistry » 5.1 Measuring energy changes
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