ACS Domain 6: Dynamics Welcome to your ACS Domain 6: Dynamics 1. ACS: Dynamics A reaction has a rate constant \( k = 4.5 \times 10^{-3} \) s\(^{-1}\) at 300 K. If the activation energy is 75 kJ/mol, what is the rate constant at 350 K? (R = 8.314 J/mol\cdot \( 1.3 \times 10^{-2} \) s\(^{-1}\) \( 2.6 \times 10^{-2} \) s\(^{-1}\) \( 9.0 \times 10^{-3} \) s\(^{-1}\) \( 7.1 \times 10^{-2} \) s\(^{-1}\) None 2. ACS: Dynamics What is the half-life of a second-order reaction with a rate constant of \( 0.1 \) M\(^{-1}\)s\(^{-1}\) and an initial concentration of 0.05 100 s 200 s 300 s 400 s None 3. ACS: Dynamics If the reaction quotient \( Q \) for a reaction is less than the equilibrium constant \( K \), what can be inferred about the direction of the reactio The reaction does not proceed. The reaction proceeds in the reverse direction. The reaction proceeds in the forward direction. The reaction is at equilibrium. None 4. ACS: Dynamics A catalyst increases the rate of a chemical reaction Increasing the equilibrium constant \( K \). Decreasing the equilibrium constant \( K \). Lowering the activation energy. Providing an alternative reaction pathway with a higher activation energy. None 5. ACS: Dynamics The rate of disappearance of A in the reaction 2A + B ? C is given by \(-\frac{d[A]}{dt} = k[A]^2[B]\). If the concentration of A is halved, how does the rate of the reaction chang The rate is halved. The rate is quartered. The rate is doubled. The rate remains the same. None 6. ACS: Dynamics For a reaction with a delta G of +30 kJ/mol at 298 K, what can be said about the spontaneity of the reactio The reaction is spontaneous. The reaction is non-spontaneous. The reaction is at equilibrium. Spontaneity cannot be determined without more information. None 7. ACS: Dynamics What is the effect of doubling the concentration of B in a reaction where the rate law is \( Rate = k[A][B]^2 \ The rate doubles. The rate quadruples. The rate is halved. The rate increases eightfold. None 8. ACS: Dynamics A reaction mechanism consists of two steps: \( A \rightarrow B \) (slow) and \( B + C \rightarrow D \) (fast). What is the rate-determining ste \( A \rightarrow B \) \( B + C \rightarrow D \) Both steps contribute equally. Cannot be determined without knowing the concentrations. None 9. ACS: Dynamics The activation energy for a reaction is 125 kJ/mol, and the reaction is first order. What would likely happen to the half-life of the reaction if the temperature is increase The half-life decreases. The half-life increases. The half-life remains the same. The half-life initially increases, then decreases. None 10. ACS: Dynamics The rate of disappearance of A in the reaction 2A + B ? C is given by \(-\frac{d[A]}{dt} = k[A]^2[B]\). If the concentration of A is halved, how does the rate of the reaction chang The rate is halved. The rate is quartered. The rate is doubled. The rate remains the same. None 1 out of 10 Time is Up! Time's up
