15. Chemical Equilibrium

Le Chatelier's Principle

객관식
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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교과서 질문
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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교과서 질문
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?
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교과서 질문
Why do catalysts not alter the amounts of reactants and products present at equilibrium?
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교과서 질문
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)
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객관식
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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객관식
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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교과서 질문
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 whenA catalyst is added?
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교과서 질문
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
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교과서 질문
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
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교과서 질문
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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교과서 질문
The reaction Fe 3+(aq) + Cl -(aq) ⇌ FeCl 2+(aq) is endothermic. How will the equilibrium concentration of FeCl 2+ change whenCl - is precipitated by addition of AgNO3?
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객관식
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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교과서 질문
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
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교과서 질문
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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