Chemistry Quiz: Reaction Kinetics

What is the general form of a second-order rate law?

• Rate = k[A]²

• Rate = k[A][B]

• Both a and b

In a reaction mechanism, what does the molecularity of an elementary step indicate?

• The number of molecules involved in the step

• The overall reaction order

• The activation energy

How does increasing temperature affect the reaction rate?

• Increases due to more collisions with sufficient energy

• Decreases due to higher activation energy

• Remains unchanged

What is the activation complex in a reaction?

• The intermediate stable product

• A short-lived high-energy transition state

• The final product

Which factor affects reaction rate according to the Arrhenius equation?

• Activation energy

• Atomic radius

• Molecular weight

What is a catalyst's role in a reaction?

• Lowers activation energy

• Increases reactant concentration

• Changes the reaction equilibrium

Which type of catalyst works within biological systems?

• Heterogeneous catalyst

• Enzyme

• Metal oxide

What is the effect of a catalyst on Gibbs free energy (Delta G) of a reaction?

• Lowers Delta G

• No effect on Delta G

• Increases Delta G

Which statement about reaction mechanisms is true?

• The slowest step determines the reaction rate

• All steps occur at the same rate

• The first step is always the slowest

In enzyme catalysis, what binds to the active site of an enzyme?

• The catalyst

• The substrate

• The inhibitor