Which of the following best describes the result of using a catalyst in a chemical reaction?
A. The yield of product is increased.
B. A more desirable product is often formed.
C. A greater amount of heat energy is released by the reaction.
D. The reaction is completed in a shorter amount of time.
D. The reaction is completed in a shorter amount of time.
To determine the best answer choice, let's understand the role of a catalyst in a chemical reaction. A catalyst is a substance that speeds up the rate of a chemical reaction by providing an alternative reaction pathway with a lower activation energy.
Now let's consider the answer choices:
A. The yield of product is increased: This statement is generally true, as a catalyst can enhance the rate of a reaction, leading to a higher overall yield of product.
B. A more desirable product is often formed: While a catalyst can influence the reaction rate, it does not necessarily alter the products formed. The catalyst specifically affects the rate of reaction but does not change the nature of the reactants or products involved.
C. A greater amount of heat energy is released by the reaction: The presence of a catalyst does not directly affect the amount of heat energy released by a reaction. Catalysts facilitate reactions by providing a new pathway, but they do not change the thermodynamics or energy changes associated with the reaction.
D. The reaction is completed in a shorter amount of time: This statement is true. A catalyst speeds up the reaction rate by lowering the activation energy required for the reaction to occur. Consequently, the reaction is completed more quickly in the presence of a catalyst.
Based on the explanations above, the correct answer is option D. The use of a catalyst in a chemical reaction often results in the reaction being completed in a shorter amount of time.