Compare a Reaction Quotient with Its Equilibrium Constant - Practice 1

For the stated ideal reaction A <-> B at fixed temperature, use Q = [B]/[A] with consistent standard-state conventions.

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For the stated ideal reaction A <-> B at fixed temperature, use Q = [B]/[A] with consistent standard-state conventions. If Q < K the forward direction is favored toward equilibrium; if Q > K the reverse direction is favored. At Q = K there is no net reaction, not no molecular activity.

Worked example

For K = 4 and concentrations giving Q = 2, forward conversion toward B is favored until equilibrium is approached.

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At dynamic chemical equilibrium, forward and reverse reactions can keep happening at equal rates. No net change does not mean every molecule stops reacting.

Question 1 Ideal A <-> B case 1: [A] = 1 concentration unit, [B] = 1 units and K = 4. Which net direction is favored? forward toward B reverse toward A no net change at equilibrium

Question 2 Ideal A <-> B case 2: [A] = 1 concentration unit, [B] = 2 units and K = 4. Which net direction is favored? reverse toward A no net change at equilibrium forward toward B

Question 3 Ideal A <-> B case 3: [A] = 1 concentration unit, [B] = 4 units and K = 4. Which net direction is favored? reverse toward A no net change at equilibrium forward toward B

Question 4 Ideal A <-> B case 4: [A] = 1 concentration unit, [B] = 6 units and K = 4. Which net direction is favored? reverse toward A forward toward B no net change at equilibrium

Question 5 Ideal A <-> B case 5: [A] = 1 concentration unit, [B] = 8 units and K = 4. Which net direction is favored? forward toward B no net change at equilibrium reverse toward A

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