Question

a researcher is designing a laboratory experiment to determine whether the inorganic substance a affects the rate of reaction between two colored liquids, x and y. when the reaction is complete, the liquid is clear. the reaction between x and y is similar to one used by manufacturers to produce certain chemicals in factories. which method would best answer his question about reaction rate and what will he find out about substance a? first, he should measure the final temperature of the liquid when x and y react without substance a. then, he should measure the final temperature when he adds substance a to x and y. he will find out if substance a is a catalyst first, he should measure how long it takes for the liquid to become clear if x and y are mixed together. then, he should measure how long it takes if he also adds substance a to x and y. he will find out if substance a is a catalyst first, he should measure the final temperature of the liquid when x and y react without substance a. then, he should measure the final temperature when he adds substance a to x and y. he will find out if substance a is an enzyme first, he should measure how long it takes for the liquid to become clear if x and y are mixed together. then, he should measure how long it takes if he also adds substance a to x and y. he will find out if substance a is an enzyme

Explanation:

To determine the effect of substance A on the reaction rate between X and Y, measuring the time it takes for the liquid to become clear (indicating the completion of the reaction) with and without substance A is the appropriate method. If substance A changes the reaction - rate, it could be a catalyst. Enzymes are a type of biological catalyst, but since substance A is described as inorganic, it is less likely to be an enzyme. Measuring temperature does not directly measure the reaction rate.

Answer:

First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst.