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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? Question 7 options: Human error is uncontrolled. There is no problem with his design. There are two variables in each trial. The concentration of the acid is too dilute.

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The problem with this experimental design is that there are two variables in each trial.

In every experiment, there must be a dependent and an independent variable. The dependent variable is altered as the independent variable changes in each trial.

In an experiment, a variable is held constant while the other is changed to see the effect of changes in one variable on another variable. We can see that in each trial, both the surface area and concentration of the reactants are altered simultaneously making it impossible to obtain accurate results about the rate of reaction.

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