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

[Q]: The long bone work as lever.
[A]: What type of function does the long bone perform?

[Q]: Atoms of metals are good conductors of electricity because they give up electrons.
[A]: Why are atoms of metals good conductors of electricity?

[Q]: For an exothermic chemical reaction, energy is given off as reactants are converted to products.
[A]:
For an exothermic chemical reaction, energy is given off as reactants are converted to what?