LL8 [Reaction Kinetics Portfolio]

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

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

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

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