How does a catalyst increase a reaction's rate?

• It increases the energy of the reactants.

• It provides a different pathway for the reaction that has a lower activation energy.

Which of these reactions would be faster?

• Magnesium with concentrated hydrochloric acid.

• Magnesium with dilute hydrochloric acid.

When a reversible reaction occurs in a sealed reaction vessel, when is equilibrium reached?

• When the amounts of products and reactants are equal.

• When the rates of the forward and reverse reactions are equal.

True or False? "The mean rate of reaction can be found by measuring the amount of reactant used over a period of time."

• True

• False

The rate of a reaction doesn't depend on the...

• ...frequency of collisions.

• ...volume of solution.

• ...temperature of the reactants.

True or False? "A reversible reaction can take in energy in both directions."

• True

• False

Increasing the concentration of a reactant in a solution means that the solution...

• ...contains more reactant particles.

• ...contains fewer reactant particles.

Which of the following is not a unit of reaction rate?

• g/s

• cm³/s

• g/dm³

What is a reversible reaction?

• A reaction where the products of the reaction can react to produce further products.

• A reaction where the products of the original reaction can react to produce the original reactants.

Which of the following is a reason why increasing the temperature increases the rate of a reaction.

• The reactant particles stick together more.

• The reactant particles move faster so they collide more frequently.