Factors affecting equilibrium and K Quiz
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5 questions, one answer each
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1. Which change alters the value of Kc for a reaction at equilibrium?
- A. adding a catalyst
- B. increasing the concentration of a reactant
- C. increasing the pressure
- D. changing the temperature
2. A catalyst is added to a system at equilibrium. What is the effect?
- A. The yield of product increases
- B. Equilibrium is reached faster with no change in composition
- C. Kc increases
- D. The position moves to the side with fewer moles
3. A reaction has K = 1.0 × 10⁻⁸ at 298 K. What does this show?
- A. It goes almost to completion
- B. It goes about halfway
- C. The mixture at equilibrium is mainly reactants
- D. The reaction is very fast
4. The temperature of an exothermic reaction at equilibrium is raised. What happens to K and to the position?
- A. K increases and the position moves right
- B. K decreases and the position moves left
- C. K is unchanged and the position moves left
- D. K decreases and the position moves right
5. A reaction has ΔStotal = +41.55 J K⁻¹ mol⁻¹. What is K? (R = 8.31 J K⁻¹ mol⁻¹)
- A. 5.0
- B. 41.55
- C. 1.5 × 10²
- D. 3.5 × 10²