For which of the following reactions are both reactants and products likely to be found when the reaction appears to be complete? How can you tell?
- Mg + O2 --> 2MgO
- HF + H2O <--> H3O(+) + F(-)

Respuesta :

the answer is
HF + H2O <--> H3O(+) + F(-)

HF + H2O gives  H3O(+) + F(-)
and

 H3O(+) + F(-) gives HF + H2O
it is a reciprocal reacation, so

reactions are both reactants and products

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