Answer:
A
Explanation:
because you can turn the melted iron back to the solid it was before
A process called fission which generates heat to produce steam, which is used by a turbine generator to generate electricity.
Answer : The oxygen will appears in the final chemical equation as a reactant.
Explanation :
The given chemical reactions are:
(1) 
(2) 
Now we are adding reaction 1 and reaction 2, we get the final chemical equation.
The final chemical equation is:

Thus, the oxygen will appears in the final chemical equation as a reactant.