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Hydrogen iodide is produced by the reaction between hydrogen and iodine - VCE - SSCE Chemistry - Question 14 - 2007 - Paper 1
Question 14
Hydrogen iodide is produced by the reaction between hydrogen and iodine. $$\text{H}_2(g) + \text{I}_2(g) \rightleftharpoons 2 \text{HI}(g)$$ Two experiments were c... show full transcript
Worked Solution & Example Answer:Hydrogen iodide is produced by the reaction between hydrogen and iodine - VCE - SSCE Chemistry - Question 14 - 2007 - Paper 1
Step 1
The results show that experiment 2 was conducted at a
Answer
To determine the conditions of Experiment 2, we analyze the graph showing the amount of hydrogen iodide produced over time for both experiments. Since the amount of HI produced in Experiment 2 is greater than in Experiment 1 at a specific time, it indicates that Experiment 2 was conducted at a higher temperature.
In exothermic reactions, increasing the temperature favors the reverse reaction leading to reduced product yield; conversely, increasing the temperature in an endothermic reaction tends to shift the equilibrium towards the products, resulting in greater yield.
Given that more HI is produced in Experiment 2, it can be concluded that this reaction is exothermic, validating that the heat supplied increases the amount of hydrogen iodide.
Therefore, the correct answer is D: higher temperature than experiment 1 and the reaction is exothermic.