Quiz 1 - Reaction Rate - Chemistry - Grade 12- W5

One factor that cannot be adjusted in order to improve a reaction rate is

• temperature

• surface area.

• nature of the reactant.

• concentration

• ...

Catalysts affect reaction rates by

• forming an activated complex with lower energy.

• broadening the energy barrier.

• increasing the activation energy.

• changing the net thermodynamics of the reaction

• ....

A rate law relates

• reaction rate and temperature.

• reaction rate and concentrations of reactants.

• temperature and concentrations of reactants.

• energy and concentrations of reactants.

• ..

If the concentration of reactants is higher,

• the reaction rate is generally higher.

• the reaction rate is generally lower.

• the reaction rate is generally not affected.

• the rate-determining step is eliminated.

• ...

To find a reaction order, compare the rate ratio with the

• time ratio.

• temperature ratio.

• pressure ratio.

• concentration ratio.

• ...

If the concentration of a reactant in a mixture is tripled and the reaction rate increases by a factor of nine, the reaction order with respect to that reactant is

• zero

• one

• two

• three

• ...

The specific rate constant, k,

• changes for different concentrations of reactants.

• doesn’t change for different concentrations of reactants.

• is not affected by increasing temperature.

• is not affected by addition of a catalyst.

• ...

The rate-determining step of a reaction is always the

• first step.

• last step.

• fastest step.

• slowest step.

• ...

Which factor(s) can influence the rate of a reaction?

• surface area

• temperature

• concentration

• All of the above

• ...

Which process is used to speed up chemical reactions?

• inhibition

• activation

• catalysis

• calorimetry

• ...