Question

classify the actions based on how they could affect a reaction rate.

rate increases
rate decreases
rate is unaffected

answer bank
decrease the concentration of a reactant
add a catalyst
decrease the surface area of a solid reactant
increase the temperature

Explanation:

Analyze the effect of temperature and catalysts

Using the Reaction Rates knowledge point, we analyze how temperature and catalysts influence chemical kinetics. Increasing temperature provides molecules with more kinetic energy, leading to more frequent and energetic collisions. Adding a catalyst lowers the activation energy barrier, allowing the reaction to proceed faster. Both actions increase the rate.

Analyze the effect of concentration and surface area

Using the Reaction Rates knowledge point, we examine how concentration and surface area affect kinetics. Decreasing the concentration of a reactant reduces the frequency of collisions between reactant particles. Decreasing the surface area of a solid reactant limits the contact area available for collisions. Both actions decrease the rate.

Classify each action into the correct category

We place each item from the Answer Bank into its corresponding category based on our kinetic analysis:

• "add a catalyst" and "increase the temperature" go to "Rate increases".
• "decrease the concentration of a reactant" and "decrease the surface area of a solid reactant" go to "Rate decreases".
• No actions from the bank leave the rate unaffected.

Answer:

Rate increases	Rate decreases	Rate is unaffected