You were warned to read the questions and that Observations D-1 and D-2 are not the same as Procedure D-1 and D-2. However, many of you answered the question (#6) referring to the procedure steps rather than the observations.
Reading questions and listening to instructions are important skills and increase the chances of you supplying the desired information.
In the lab, only the electrons were mobile, and then only a very tiny fraction of the total electron population. The total electron population comprises many tens of thousands of Coulombs, whereas the net charges were probably fractions of a micro ( 1E-6) Coulomb.
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