Rate of Reaction and Molecularity Worksheet

The rate of a reaction depends on:

• Concentration of reactants

• Temperature

• Presence of catalyst

• All of these

The rate of reaction is defined as:

• Increase in concentration of reactants per unit time

• Decrease in concentration of reactants per unit time

• Increase in concentration of products per unit time

• Both B and C

The instantaneous rate of a reaction is obtained by:

• Drawing tangent to concentration vs. time graph

• Drawing a chord

• Using average rate

• Measuring total time

Molecularity refers to:

• Number of molecules involved in the overall reaction

• Order of reaction

• Mechanism of reaction

• Catalyst concentration

The molecularity of a reaction can never be:

• 1

• 2

• 3

• Fractional

The order of a reaction:

• Is always an integer

• Can be fractional or zero

• Is same as molecularity

• Cannot be determined experimentally

The rate law for a reaction is given by r=k[A]2[B]. The overall order is:

• 2

• 3

• 1

• ½

The rate constant (k) depends on:

• Temperature

• Catalyst

• Nature of reactants

• All of these

Units of rate constant for a first-order reaction are:

• mol L⁻¹ s⁻¹

• s⁻¹

• L mol⁻¹ s⁻¹

• mol² L⁻² s⁻¹

For a zero-order reaction, rate = k means:

• Rate depends on concentration

• Rate does not depend on concentration