Wzorowane na: Chemistry HL Paper 1B, May 2025, TZ3, pytanie 1(b). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Informacja do zadań 1a-1e.
Nitrogen dioxide,
The sealed vessel was left for the reaction to proceed. Suggest two properties of the system, other than its colour, that could be measured to follow the progress of the reaction over time, and predict how each would change as the forward reaction proceeds.
Property 1: temperature «of the gas mixture» ✔
Expected change: increases «because the forward reaction is exothermic» ✔
Property 2: pressure «inside the vessel, at constant volume» ✔
Expected change: decreases «because two moles of gas become one mole» ✔
OR
Property: absorbance in the IR/UV region «at a wavelength absorbed by or » ✔
Expected change: absorbance due to decreases / absorbance due to
[1] for each measurable property (temperature; pressure at constant volume or volume at constant pressure; IR or UV absorbance) and [1] for the matching direction of change. A property given with the wrong direction earns [1 max] for that pair. Mass does not score, since it is constant in a sealed vessel; colour is excluded by the question.
Volume at constant pressure (decreasing) or gas density at constant pressure (increasing) are acceptable alternatives to pressure.
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