Beskoon die volgende hipotetiese reaksie wat by 150 °C eewig bereik in 'n 4 dm³ geslote houer - NSC Physical Sciences - Question 6 - 2023 - Paper 2
Question 6
Beskoon die volgende hipotetiese reaksie wat by 150 °C eewig bereik in 'n 4 dm³ geslote houer.
2AB(g) ⇌ A2(g) + B2(g)
Die grafiek hieronder toon die veranderingen ... show full transcript
Worked Solution & Example Answer:Beskoon die volgende hipotetiese reaksie wat by 150 °C eewig bereik in 'n 4 dm³ geslote houer - NSC Physical Sciences - Question 6 - 2023 - Paper 2
Step 1
Skryf die betekenis van die term omkeerbare reaksie neer.
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Answer
A reversible reaction is one where products can be converted back to reactants, and vice versa. This means the reaction can proceed in both forward and reverse directions.
Step 2
Stel Le Chatalier se beginsel.
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Answer
Le Chatelier's principle states that if an equilibrium in a closed system is disturbed, the system will adjust to minimize that disturbance by favoring either the forward or reverse reaction as needed.
Step 3
'n Verandering is aan die ewewigssysel by t = 80 s aangebring.
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Answer
6.3.1 The concentration of A2(g) was increased, indicating that more of A2 was added to the system.
6.3.2 According to Le Chatelier's principle, increasing the concentration of A2(g) will shift the equilibrium to the right, favoring the forward reaction to produce more B2(g) and AB(g), thus reducing the amount of A2(g) added.
Step 4
Bereken die ewewigskonstante, Kc, by t = 120 s.
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Answer
To calculate the equilibrium constant Kc, use the formula:
Kc=[AB]2[A2][B2]
At t = 120 s, suppose the concentrations are:
[A2] = 2.0 mol/dm³,
[B2] = 2.0 mol/dm³,
[AB] = 4.0 mol/dm³.
Then,
Kc=(4.0)2(2.0)(2.0)=16.04.0=0.25
Step 5
Sal die ewewigskonstante, Kc, by 100 °C GROTER AS, KLEINER AS OF GELYK AAN die by 150 °C wees? Verduidelik die antwoord.
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Answer
At a lower temperature (100 °C), the equilibrium constant Kc will generally decrease for an exothermic reaction, favoring the reactants more than products. This suggests that Kc at 100 °C will be smaller than at 150 °C.
Step 6
Teken 'n potensiële-energiediagram vir hierdie reaksie.
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Answer
The potential energy diagram should show the potential energy of reactants, the transition state, and the products. The reactants should have higher energy than the products if the reaction is exothermic, with a peak representing the activation energy.
Step 7
Beskryf die invloed van die teenwoordigheid van 'n katalisator op die reaksietyd.
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Answer
The presence of a catalyst decreases the activation energy required for the reaction to occur, thereby increasing the rate of reaction. It speeds up both the forward and reverse reactions equally, ultimately not affecting the position of the equilibrium but allowing it to be reached more quickly.
