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

Which factor increases the frequency of reactant particle collisions in a chemical reaction?

• Decreasing temperature

• Increasing surface area

• Reducing concentration

• Lowering gas pressure

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

• It decreases the rate

• It has no effect

• It increases the rate

• It only affects reactions in closed systems

What is the role of a catalyst in a chemical reaction?

• It increases the activation energy

• It provides an alternative pathway with lower activation energy

• It decreases the concentration of reactants

• It increases the temperature of the reaction

Which of the following factors does NOT affect the rate of a chemical reaction?

• Temperature

• Surface area

• Colour of reactants

• Presence of a catalyst

In an energy profile diagram, what does the peak represent?

• The energy of reactants

• The activation energy

• The energy of products

• The rate of reaction

How does temperature affect the rate of a chemical reaction?

• Higher temperature decreases the rate

• Higher temperature increases the rate

• Temperature has no effect

• Only affects reactions in open systems

What is the effect of increasing gas pressure on the rate of a reaction involving gases?

• It decreases the rate

• It has no effect

• It increases the rate

• It only affects reactions in closed systems

Which of the following best describes activation energy?

• The energy required to start a reaction

• The energy released by a reaction

• The energy of the products

• The energy of the reactants

What is the effect of a catalyst on the equilibrium position of a reaction?

• It shifts the equilibrium to the right

• It shifts the equilibrium to the left

• It has no effect on the equilibrium position

• It increases the concentration of products

Which factor is most likely to affect the orientation of reactant particles during a collision?

• Temperature

• Surface area

• Concentration

• Molecular structure