Factors Affecting the Rate of Reaction

The video tutorial explains the factors affecting the rate of chemical reactions, including the number of collisions, energy of particles, pressure, concentration, surface area, temperature, and the use of catalysts. It highlights how each factor influences the frequency and energy of collisions, thereby affecting the reaction rate. The tutorial also provides examples and graphs to illustrate these concepts.

What are the two main factors that determine the rate of a chemical reaction?

• The color and smell of reactants

• The type of catalyst used

• The number of collisions and energy of collisions

• The size and shape of the container

How does increasing the concentration of reactants affect the reaction rate?

• It changes the color of the reactants

• It decreases the reaction rate

• It has no effect on the reaction rate

• It increases the reaction rate

What happens to the reaction rate when the surface area of a solid reactant is increased?

• The reaction rate decreases

• The reaction rate remains unchanged

• The reaction rate increases

• The reaction rate becomes unpredictable

Why do smaller particles of a solid react faster than larger ones?

• They have a higher mass

• They are more colorful

• They have a larger surface area to volume ratio

• They are denser

How does increasing temperature affect the rate of reaction?

• It increases the rate of reaction

• It changes the state of reactants

• It has no effect on the rate of reaction

• It decreases the rate of reaction

What role does a catalyst play in a chemical reaction?

• It decreases the energy of collisions

• It changes the reactants into different products

• It provides an alternative pathway with lower activation energy

• It increases the number of collisions

Which of the following is NOT affected by the presence of a catalyst?

• The activation energy

• The number of collisions

• The reaction rate

• The energy of collisions