Which reaction can be predicted from the activity series? A. 2Cl(g)  Cl2(g) B. HCl(aq) + NaOH(aq)  NaCl(aq) + H2O(l) C. 2H2O(aq) + 2Na(s)  2NaOH(aq) + H2(g) D. Cl2(g)  2Cl(g)

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

the answers would be

the first one and the second one