A researcher is designing a laboratory experiment to determine whether the inorganic substance A affects the rate of a 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 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 catalys

Explanation:

did the test rn

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

a physical change is being made.