| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.sl.TZ2.19 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Identify | Question number | 19 | Adapted from | N/A |
Question
Hydrogen and iodine react in a closed vessel to form hydrogen iodide.
\[{{\text{H}}_2}{\text{(g)}} + {{\text{I}}_2}{\text{(g)}} \rightleftharpoons {\text{2HI(g)}}\]
At 350 °C \({K_{\text{c}}} = 60\)
At 445 °C \({K_{\text{c}}} = 47\)
Which statement is correct when the system is at equilibrium at 350 °C?
A. The concentrations of all reactants and products are equal.
B. The concentrations of the reactants are greater than the concentration of the product.
C. The reaction, as written, barely proceeds at this temperature.
D. The reaction, as written, goes almost to completion at this temperature.
Markscheme
D
Examiners report
A comment was made that “barely” in answer C may have been difficult for those working in their second language. We acknowledge this, and will avoid its use.
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