Question

A scientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. The scientist repeats the experiment several times, each time increasing the amount of acid used. The dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

Answer 1

First you should know that a dependent variable is the one which its values depends of the ones of other variable. In this case, the final mass is the dependent variable because this amount directly depends on how much acid the scientist pours in the initial mass to increase or decrease it. This is also why she remeasures it once the experiment is done.