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Gases A2(g) and B2(g) are placed in a closed container of variable volume, as shown - HSC - SSCE Chemistry - Question 33 - 2023 - Paper 1
Question 33
Gases A2(g) and B2(g) are placed in a closed container of variable volume, as shown. The reaction between these substances is as follows. A2(g) + 2B2(g) ⇌ 2AB2(g) Δ... show full transcript
Worked Solution & Example Answer:Gases A2(g) and B2(g) are placed in a closed container of variable volume, as shown - HSC - SSCE Chemistry - Question 33 - 2023 - Paper 1
Step 1
Explain what is happening in this system between 6 minutes and 8 minutes.
Answer
The system is at equilibrium between 6 and 8 minutes. During this period, the forward and reverse reactions occur at the same rate, meaning the concentrations of A2(g), B2(g), and AB2(g) remain constant. This indicates no net change in the amounts of the substances present.
Step 2
Explain TWO different factors that could result in the disturbance at 8 minutes.
Answer
At 8 minutes, there is an instantaneous change in the amount of AB2(g) being consumed, leading to the production of A2(g) and B2(g). This change could be influenced by:
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An increase in temperature that decreases the equilibrium constant K. This could elevate the reaction quotient Q, which will be greater than K, causing AB2(g) to be consumed and resulting in the production of A2(g) and B2(g) until the system approaches K and equilibrium is re-established.
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An increase in volume of the container. This expansion will decrease the pressure, thus affecting the reaction quotient Q. As a result, AB2(g) will be consumed, leading to the generation of A2(g) and B2(g) as the system shifts towards reestablishing equilibrium.