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What action would result in an increase in the rate of a chemical reaction?

Rationale

Using a mortar and pestle to grind a solid reactant to a powder.

Grinding a solid reactant into a powder increases its surface area, allowing more particles to collide effectively during the reaction. This enhanced interaction leads to a higher frequency of collisions, which can significantly accelerate the rate of the chemical reaction.

A (Adding more of the reactants) YOUR ANSWER

While adding more reactants can increase the concentration and potentially raise the reaction rate, it does not fundamentally change the nature of how reactants interact. If the reactants are already in a solid state with limited surface area, merely increasing their quantity may not result in a notable increase in reaction rate compared to altering the form of the reactants.

B (Decreasing the temperature of the reactants) YOUR ANSWER

Decreasing the temperature generally slows down molecular movement, reducing the frequency and energy of collisions between reactant molecules. This decrease in kinetic energy leads to a lower reaction rate, making this choice counterproductive for accelerating chemical reactions.

C (Using a mortar and pestle to grind a solid reactant to a powder) CORRECT

This choice is correct because grinding solid reactants increases their surface area, allowing for more effective collisions between particles. The greater exposure enhances the rate of the reaction, making it a highly effective method to increase reaction speed.

D (Sealing the reaction in an airtight container) YOUR ANSWER

Sealing a reaction in an airtight container can prevent the escape of gases or volatile substances, but it does not directly increase the rate of the reaction. In fact, it may limit the reaction by preventing the introduction of additional reactants or reducing the ability for gaseous products to escape, thus potentially hindering overall progress.

Conclusion

To accelerate a chemical reaction, increasing the surface area of solid reactants through grinding is particularly effective, as it facilitates more collisions among reactant particles. Other options, such as sealing the reaction or decreasing temperature, may inhibit the reaction rate rather than enhance it. Therefore, utilizing a mortar and pestle is the most effective strategy to achieve a faster reaction.

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