Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Input: Consider Input: Resistors connected end to end are said to be in series.

Output: Resistors connected end to end are said to be in what?


Input: Consider Input: Rubber is an example of a(n) insulators that does not allow electrons to move through them.

Output: Rubber is an example of what type of substances that do not allow electrons to move through them?


Input: Consider Input: Balanced chemical reactions are balanced in terms of moles.
Output: Balanced chemical reactions are balanced in what?