Problem 113 - Chemistry: An Atoms-Focused Approach

Question

Does a substance that increases the rate of a reaction also increase the rate of the reverse reaction?

Step-by-Step Solution

Answer

Explain your answer. Answer: Yes, a substance that increases the rate of a reaction (catalyst) can also increase the rate of the reverse reaction. This is because the catalyst reduces the activation energy for both forward and reverse reactions without changing the position of the equilibrium, providing an alternate pathway with lower activation energy for both reactions.

Step 1: Understand the role of a catalyst

A substance that increases the rate of a reaction is often called a catalyst. A catalyst is a substance that increases the rate of a chemical reaction by reducing the energy required for the reaction to occur, without being consumed in the process.

Step 2: Identify what affects reaction rates

Reaction rates are influenced by various factors, such as temperature, pressure, concentration, and the presence of a catalyst. In this exercise, we will focus on the role of a catalyst in affecting reaction rates.

Step 3: Consider the impact of a catalyst on forward and reverse reactions

A catalyst can increase the rate of a forward reaction by providing an alternate pathway with lower activation energy. However, it is crucial to remember that a catalyst does not change the overall energy balance of the reaction. In other words, the position of equilibrium remains unchanged.

Step 4: Analyze the catalyst's effect on the reverse reaction

Since a catalyst provides an alternate pathway with lower activation energy for both forward and reverse reactions, and it does not change the overall energy balance of the reaction, it means that it can potentially increase the rate of the reverse reaction as well.

Step 5: Conclusion

A substance that increases the rate of a reaction (catalyst) can also increase the rate of the reverse reaction. This is because the catalyst reduces the activation energy for both forward and reverse reactions without changing the position of the equilibrium.