Question

Zach wants to run an experiment on reaction rates. He designs an experiment testing the reaction rate changes when magnesium and hydrochloric acid react. He decides to run one trial with magnesium ribbon and 1.0 M HCl. For his second trial he rolls the magnesium ribbon into a tight coil and reacts it with 2.0 M HCl. In the third trial, Zach cuts the same amount of Magnesium into slivers and reacts them with 3.0 M HCl. What is the problem with Zach's experimental design?

Answer 1

Answer:

The correct answer would be - there are two variable parameters in the experiment.

Explanation:

Zach wants to test the reaction rate of the magnesium and hydrochloric acid. In the experiment of the Zach, there are at least two different variable categories namely, concentration and surface area of the reactants.

Both the parameters of the reactants which are magnesium and hydrochloric acid will influence the rate of the reaction altogether. If concentration and surface area both are in experiment design, you can not depend on the rate of reaction due to both variables influence the rate of reaction.

Thus, the correct answer is - there are two different variable parameters in the experiment.