Kinetics Kinetics 1 / 10 The activation energy for a reaction is zero. What is the temperature dependence of the rate constant? Rate constant decreases with temperature Rate constant remains constant Rate constant increases linearly with temperature Rate constant is independent of temperature 2 / 10 In a consecutive reaction A → B → C, if the first step is rate-determining, the rate law depends on: Concentration of A only Concentration of B only Concentrations of A and B Concentration of C only 3 / 10 What is the relationship between rate constant k and temperature in the Arrhenius equation? Linear Logarithmic Exponential Quadratic 4 / 10 The steady-state approximation is applied to: Identify the rate-determining step Approximate the concentration of intermediates Calculate equilibrium constants Eliminate rate constants 5 / 10 If the half-life of a first-order reaction is 10 minutes, what fraction of the reactant remains after 30 minutes? 1/2 1/4 1/8 1/16 6 / 10 The rate constant of a reaction increases from 1.5 × 10⁻² s⁻¹ to 4.5 × 10⁻² s⁻¹ when the temperature is increased from 300 K to 310 K. What is the activation energy of the reaction? (Assume R = 8.314 J/mol·K) 50.2 kJ/mol 62.3 kJ/mol 44.8 kJ/mol 38.6 kJ/mol 7 / 10 For a second-order reaction, what is the half-life proportional to? Concentration of reactant Square of the concentration of reactant Inverse of the concentration of reactant Independent of concentration 8 / 10 A reaction has a rate equation r = k[A]²[B]. By what factor will the rate increase if the concentration of A is doubled and B is halved? 2 4 8 1 9 / 10 What does the slope of a ln k vs. 1/T plot represent? Activation energy Negative activation energy divided by R Pre-exponential factor Reaction order 10 / 10 For a first-order reaction, the time required to reduce the concentration of a reactant to 25% of its initial value is: Half-life Twice the half-life Three times the half-life Four times the half-life Your score is By WordPress Quiz plugin
