Factors Affecting Reaction Rates

This video tutorial explains the main factors affecting reaction rates: concentration, pressure, temperature, and surface area. It details how each factor influences the rate of reaction through examples and theoretical explanations. Concentration affects the number of particles in a given volume, pressure impacts reactions involving gases, temperature influences the kinetic energy of particles, and surface area determines the exposure of reactants. The video concludes with a recap of these factors and their effects on reaction rates.

Which of the following is NOT a factor affecting reaction rate?

• Color

• Surface Area

• Pressure

• Concentration

How can concentration be increased in a solution?

• By increasing the volume and keeping the number of particles the same

• By decreasing the number of particles and increasing the volume

• By increasing the number of particles while keeping the volume the same

• By decreasing both the number of particles and the volume

What happens to the reaction rate when the concentration of hydrochloric acid is increased?

• The reaction rate becomes zero

• The reaction rate decreases

• The reaction rate remains the same

• The reaction rate increases

Why does pressure only affect reactions involving gases?

• Because pressure affects only liquids

• Because gases can be compressed, affecting their concentration

• Because solids and liquids can be compressed

• Because gases cannot be compressed

What is a 'fruitful collision' in the context of reaction rates?

• A collision that does not result in a reaction

• A collision with insufficient energy

• A collision that results in a reaction

• A collision that decreases reaction rate

How does increasing temperature affect the particles in a reaction?

• It increases their kinetic energy

• It has no effect on their energy

• It makes them move slower

• It decreases their kinetic energy

What is the role of activation energy in a chemical reaction?

• It is the energy that has no effect on reaction rate

• It is the energy required to stop a reaction

• It is the energy needed to start a reaction

• It is the energy that decreases reaction rate

How does breaking a marble chip into smaller pieces affect its reaction rate with hydrochloric acid?

• It increases the reaction rate

• It decreases the reaction rate

• It has no effect on the reaction rate

• It stops the reaction completely

What happens to the surface area when a solid is broken into smaller pieces?

• The surface area becomes zero

• The surface area remains the same

• The surface area decreases

• The surface area increases

Which factor increases the rate of reaction by allowing more particles to collide with sufficient energy?

• Temperature

• Concentration

• Pressure

• Surface Area