Factors Affecting Reaction Rates

This tutorial explores factors affecting reaction rates, including the nature of reactants, concentration, surface area, catalysts, temperature, and pH. It explains how these factors influence molecular collisions and energy, using examples to illustrate changes in reaction rates. The video also discusses the rate law and the role of activation energy.

What happens to the rate of a reaction when the concentration of reactants is increased?

• The rate decreases.

• The rate increases.

• The rate becomes zero.

• The rate remains unchanged.

How does increasing the pressure affect the rate of a reaction involving gases?

• It decreases the rate.

• It stops the reaction.

• It has no effect on the rate.

• It increases the rate.

What role does surface area play in the reaction rate of solids?

• It makes the reaction reversible.

• It has no effect on the rate.

• It increases the rate.

• It decreases the rate.

How does a catalyst affect the activation energy of a reaction?

• It has no effect on the activation energy.

• It doubles the activation energy.

• It increases the activation energy.

• It decreases the activation energy.

What is the effect of increasing temperature on the rate constant of a reaction?

• The rate constant increases.

• The rate constant remains the same.

• The rate constant becomes zero.

• The rate constant decreases.

In the reaction between hydroxide and tribromide ions, what happens if the tribromide ion concentration is increased?

• The reaction stops.

• The rate increases.

• The rate remains unchanged.

• The rate decreases.

What is the effect of adding water to a reaction mixture on the rate of reaction?

• The rate remains unchanged.

• The rate decreases.

• The reaction stops.

• The rate increases.

How does decreasing the volume of a reaction mixture affect the concentration of reactants?

• The concentration becomes zero.

• The concentration decreases.

• The concentration remains unchanged.

• The concentration increases.

What happens to the reaction rate if the pH of the solution is decreased?

• The rate remains unchanged.

• The reaction stops.

• The rate decreases.

• The rate increases.

If the pH of a solution is increased, what happens to the concentration of hydroxide ions?

• The concentration decreases.

• The concentration remains unchanged.

• The concentration increases.

• The concentration becomes zero.