Unit 3 AOS 2 - Factors Influencing Reaction Rates (1A)

Which factor increases the frequency of reactant particle collisions by providing more energy to the particles?

• Surface area

• Temperature

• Concentration

• Catalyst

How does increasing the surface area of a solid reactant affect the rate of a chemical reaction?

• It decreases the rate

• It has no effect

• It increases the rate

• It changes the reaction mechanism

In a closed system, what happens to the concentration of reactants over time during a chemical reaction?

• It remains constant

• It increases

• It decreases

• It fluctuates

Which of the following is NOT a factor that affects the rate of a chemical reaction?

• Temperature

• Surface area

• Colour of reactants

• Concentration

What role does a catalyst play in a chemical reaction?

• It increases the activation energy

• It decreases the activation energy

• It changes the products of the reaction

• It decreases the concentration of reactants

Which factor is directly related to the orientation of reactant particles during a collision?

• Temperature

• Surface area

• Activation energy

• Molecular geometry

How does increasing the pressure of a gas affect the rate of a reaction involving gaseous reactants?

• It decreases the rate

• It has no effect

• It increases the rate

• It changes the reaction products

What is the effect of increasing the concentration of reactants in a solution on the rate of reaction?

• It decreases the rate

• It has no effect

• It increases the rate

• It changes the reaction mechanism

Which of the following best describes activation energy?

• The energy required to break bonds in the products

• The energy required to start a reaction

• The energy released during a reaction

• The energy required to form bonds in the reactants

In an open system, what can happen to the products of a chemical reaction?

• They remain in the system

• They can escape the system

• They convert back to reactants

• They change the system's temperature