Rate of Chemical Reactions
Chemistry ⇒ Chemical Kinetics and Equilibrium
Rate of Chemical Reactions starts at 10 and continues till grade 12.
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A reaction has a rate law: Rate = k[A][B]^2. If the concentration of B is doubled, by what factor does the rate increase?
A reaction has the rate law Rate = k[A][B]. If [A] = 0.1 mol L-1, [B] = 0.2 mol L-1, and k = 2 L mol-1 s-1, calculate the rate.
A reaction has the rate law Rate = k[A]^2. If the rate constant k = 0.5 L mol-1 s-1 and [A] = 0.2 mol L-1, calculate the rate.
A reaction is first order in A and zero order in B. If [A] is doubled and [B] is tripled, by what factor does the rate change?
A certain reaction is found to be zero order with respect to reactant A. If the initial concentration of A is 0.5 mol L-1 and the rate constant k is 0.02 mol L-1 s-1, how long will it take for the concentration of A to decrease to 0.2 mol L-1?
A reaction has the rate law: Rate = k[A][B]. If the initial rate is 0.20 mol L-1 s-1 when [A] = 0.50 mol L-1 and [B] = 0.40 mol L-1, calculate the value of the rate constant k (in L mol-1 s-1).
Consider the following data for the reaction: 2A + B → C. Initial concentrations and initial rates are given:
Experiment 1: [A] = 0.10 mol L-1, [B] = 0.10 mol L-1, Rate = 2.0 × 10-3 mol L-1 s-1
Experiment 2: [A] = 0.20 mol L-1, [B] = 0.10 mol L-1, Rate = 8.0 × 10-3 mol L-1 s-1
Experiment 3: [A] = 0.10 mol L-1, [B] = 0.20 mol L-1, Rate = 4.0 × 10-3 mol L-1 s-1
Determine the order of the reaction with respect to A and B.
For a reaction: A → Products, the rate constant k at 300 K is 2.5 × 10-3 s-1 and at 350 K is 1.0 × 10-2 s-1. Calculate the activation energy (Ea) for the reaction. (R = 8.314 J mol-1 K-1)
The rate constant of a reaction increases with increase in temperature. This is explained by which theory? (1) Collision theory (2) Transition state theory (3) Arrhenius theory (4) All of the above
The rate law for a reaction is Rate = k[A]^0[B]^1. Which statement is correct? (1) The reaction is zero order with respect to A (2) The reaction is first order with respect to B (3) The overall order is 1 (4) All of the above
Which factor does NOT affect the rate constant of a reaction? (1) Temperature (2) Catalyst (3) Concentration of reactants (4) Nature of reactants
Which of the following best defines the rate of a chemical reaction? (1) The speed at which products are formed (2) The speed at which reactants are consumed (3) The change in concentration of a reactant or product per unit time (4) The total amount of product formed at the end of the reaction
Fill in the blank: The minimum energy required for a reaction to occur is called __________ energy.
Fill in the blank: The rate law can only be determined __________ (experimentally/theoretically) for most reactions.
Fill in the blank: The rate of a zero-order reaction is __________ of the concentration of reactants.
Fill in the blank: The SI unit of rate of reaction is __________.
For a first-order reaction, the half-life is independent of the initial concentration. True or False?
True or False: A catalyst increases the activation energy of a reaction.
True or False: The rate constant for a reaction is affected by the presence of a catalyst.
True or False: The rate law for an elementary reaction can be written directly from its stoichiometry.
