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Date November 2012 Marks available 1 Reference code 12N.1.hl.TZ0.18
Level HL Paper 1 Time zone TZ0
Command term Question number 18 Adapted from N/A

Question

Consider the following information:

\[\begin{array}{*{20}{l}} {{\text{CaC}}{{\text{O}}_{\text{3}}}{\text{(s)}} \to {\text{CaO(s)}} + {\text{C}}{{\text{O}}_{\text{2}}}{\text{(g)}}} \\ {\Delta H =  + 179{\text{ kJ}}\,{\text{mo}}{{\text{l}}^{ - 1}}} \\ {\Delta S =  + 161.0{\text{ J}}\,{{\text{K}}^{ - 1}}{\text{mo}}{{\text{l}}^{ - 1}}} \end{array}\]

What happens to the spontaneity of this reaction as the temperature is increased?

A.     The reaction becomes more spontaneous as the temperature is increased.

B.     The reaction becomes less spontaneous as the temperature is increased.

C.     The reaction remains spontaneous at all temperatures.

D.     The reaction remains non-spontaneous at all temperatures.

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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