15. Chemical Equilibrium

Le Chatelier's Principle

Scelta multipla
The following data was collected for the following reaction at equilibrium
2 A (g) + 3 B (g) ⇌ C (g)
At 25 ^oC K is 5.2 x 10^-4 and at 50^oC K is 1.7 x 10^-7. Which of the following statements is true?
a) The reaction is exothermic.
b) The reaction is endothermic.
c) The enthalpy change, ΔH, is equal to zero.
d) Not enough information is given.
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The reaction CO(g) + H2O(g) ⇌ CO2(g) + H2(g) has ∆H = -9.8 kcal/mol (-41 kJ/mol). Does the amount of H2 in an equilibrium mixture increase or decrease when the temperature is decreased?
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Many carbonate minerals are insoluble in water and appear in water pipes as 'scale.' Why is scale formation typically only a problem in hot water pipes?
1757
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Why do catalysts not alter the amounts of reactants and products present at equilibrium?
1911
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Domanda del libro di testo
When the following equilibria are disturbed by increasing the pressure, does the concentration of reaction products increase, decrease, or remain the same? 2 CO2(g) ⇌ 2 CO(g) + O2(g)
1929
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Scelta multipla
Consider the reaction below:
CH₄ (g) + F₂ (g) ⇌ CF₄ (g) + HF (g) H = + 38.1 KJ/mol
The following changes will shift the equilibrium to the left except one. Which one would not cause a shift to the left?

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Scelta multipla
Consider the following gas reaction of A₂ ( shaded spheres) and B₂ ( unshaded spheres)
A₂ (g) + B₂(g) ⇌ 2 AB (g)
Which container proceeds more to completion?
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Domanda del libro di testo
The reaction H2(g) + I2(g) ⇌ 2 HI(g) has ∆H = -2.2 kcal/mol (-9.2 kJ/mol). Will the equilibrium concentration of HI increase or decrease when A catalyst is added?
3059
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Domanda del libro di testo
What effect do the listed changes have on the position of the equilibrium in the reaction of carbon with hydrogen? C(s) + 2 H2(g) ⇌ CH4(g) ∆H = -18 kcal/mol (-75kJ/mol) Increasing pressure by decreasing volume
1745
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What effect do the listed changes have on the position of the equilibrium in the reaction of carbon with hydrogen? C(s) + 2 H2(g) ⇌ CH4(g) ∆H = -18 kcal/mol (-75kJ/mol) Allowing CH4 to escape continuously from the reaction vessel
1805
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For the following equilibria, use Le Châtelier's principle to predict the direction of the reaction when the pressure is increased by decreasing the volume of the equilibrium mixture. C(s) + H2O(g) ⇌ CO(g) + H2(g)
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The reaction Fe 3+(aq) + Cl -(aq) ⇌ FeCl 2+(aq) is endothermic. How will the equilibrium concentration of FeCl 2+ change when Cl - is precipitated by addition of AgNO3?
2457
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Scelta multipla
Which direction will the following reaction (in a 10.0 L flask) proceed if a catalyst is added to the system?
CaCO₃ (s) ⇌ CaO (s) + CO₂ (g) K_p = 3.2 x 10^-28

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Domanda del libro di testo
What effect do the listed changes have on the position of the equilibrium in the reaction of carbon with hydrogen? C(s) + 2 H2(g) ⇌ CH4(g) ∆H = -18 kcal/mol (-75kJ/mol) Increasing temperature
1926
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Domanda del libro di testo
Is the yield of SO3 at equilibrium favored by a higher or lower pressure? By a higher or lower temperature? 2 SO2(g) + O2 ⇌ 2 SO3(g) ∆H = -47 kcal/mol
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