"To complete the experiment" means to finish conducting all the necessary activities or steps in order to reach a conclusion or answer a scientific question. Full definition
It provides purpose for completing an experiment, in this instance, and suggests that knowing something about the science concepts involved is worthwhile. (teachermagazine.com.au)
Provide students with URL and encourage them to complete experiment at home with parents. (educationworld.com)
Have students record their hypotheses before completing each experiment. (educationworld.com)