Factors Influencing Reaction Rates in Chemistry

The video explores factors affecting chemical reaction rates, including temperature, concentration, pressure, surface area, and catalysts. It explains collision theory, emphasizing the importance of activation energy and collision frequency. Each factor's impact on reaction rates is discussed, highlighting how they influence energy and collision frequency. Catalysts are explained as substances that lower activation energy, increasing successful collisions. The video concludes with examples of catalysts, such as transition metals and enzymes.

What is the primary theory behind chemical reactions?

• Quantum Theory

• Thermodynamic Theory

• Collision Theory

• Kinetic Molecular Theory

What must particles have to react according to collision theory?

• Magnetic attraction

• Sufficient energy known as activation energy

• Opposite charges

• A catalyst present

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

• It is the energy required to break a catalyst

• It is the energy released during the reaction

• It is the total energy of the reactants

• It is the minimum energy required for a reaction to occur

Which of the following is not a factor affecting the rate of chemical reactions?

• Presence of a catalyst

• Color of the reactants

• Temperature

• Surface area

How does increasing temperature affect the rate of a chemical reaction?

• Increases collision energy and frequency

• Has no effect on collision energy

• Reduces the activation energy

• Decreases collision frequency

What is the effect of higher concentration on the rate of reaction?

• Decreases the rate of reaction

• Increases the rate by reducing activation energy

• Increases the rate by making collisions more frequent

• Has no effect on the rate of reaction

How does pressure influence the rate of reaction in gases?

• Decreases the rate by decreasing collision frequency

• Has no effect on the rate of reaction

• Increases the rate by making collisions more frequent

• Increases the rate by increasing volume

Why does a higher surface area increase the rate of reaction?

• It increases the distance between reactant particles

• It decreases the activation energy required

• It increases the frequency of collisions

• It changes the physical state of reactants

What role does a catalyst play in a chemical reaction?

• It increases the temperature of the reaction

• It provides an alternative pathway with lower activation energy

• It increases the reactant concentration

• It acts as a reactant in the reaction

Select all correct answers. Which of the following substances commonly acts as a catalyst in chemical reactions?

• Transition metals

• Water

• Enzymes

• Sodium chloride