The equilibrium constant Kc

The equilibrium constant Kc Quiz

Edexcel A-Level Chemistry: Quiz

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  1. 1. Which is Kc for N2(g)+3H2(g)⇌2NH3(g)\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g)?

    • A. [NH3]2[N2][H2]3\frac{[\text{NH}_3]^2}{[\text{N}_2][\text{H}_2]^3}
    • B. [N2][H2]3[NH3]2\frac{[\text{N}_2][\text{H}_2]^3}{[\text{NH}_3]^2}
    • C. [NH3][N2][H2]\frac{[\text{NH}_3]}{[\text{N}_2][\text{H}_2]}
    • D. 2[NH3][N2]+3[H2]\frac{2[\text{NH}_3]}{[\text{N}_2]+3[\text{H}_2]}

  2. 2. Which is Kc for CaCO3(s)⇌CaO(s)+CO2(g)\text{CaCO}_3(s) \rightleftharpoons \text{CaO}(s) + \text{CO}_2(g)?

    • A. [CaO][CO2][CaCO3]\frac{[\text{CaO}][\text{CO}_2]}{[\text{CaCO}_3]}
    • B. [CaCO3][CaO][CO2]\frac{[\text{CaCO}_3]}{[\text{CaO}][\text{CO}_2]}
    • C. [CaO][CO2][\text{CaO}][\text{CO}_2]
    • D. [CO2][\text{CO}_2]

  3. 3. Which concentrations are used in a Kc expression?

    • A. Initial concentrations
    • B. Equilibrium concentrations
    • C. Concentrations at the start of the reaction plus the end
    • D. Concentrations of the catalyst

  4. 4. Kc for A + B ⇌ C is K. What is Kc for C ⇌ A + B?

    • A. KK
    • B. −K-K
    • C. 1K\frac{1}{K}
    • D. K2K^2

  5. 5. Which is Kc for Zn(s)+Cu2+(aq)⇌Zn2+(aq)+Cu(s)\text{Zn}(s) + \text{Cu}^{2+}(aq) \rightleftharpoons \text{Zn}^{2+}(aq) + \text{Cu}(s)?

    • A. [Zn2+][Cu][Zn][Cu2+]\frac{[\text{Zn}^{2+}][\text{Cu}]}{[\text{Zn}][\text{Cu}^{2+}]}
    • B. [Zn2+][Cu2+]\frac{[\text{Zn}^{2+}]}{[\text{Cu}^{2+}]}
    • C. [Cu2+][Zn2+]\frac{[\text{Cu}^{2+}]}{[\text{Zn}^{2+}]}
    • D. [Zn2+][Cu2+][\text{Zn}^{2+}][\text{Cu}^{2+}]

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