The following questions refer to the chemical reactions represented below. (A) 2 C6H6(l) + 15 O2(g) → 12 CO2(g) + 6 H2O(l)

(B) C2H3O2-(aq) + H3O+(aq) → HC2H3O2(aq) + H2O(l)

(C) 4 H+(aq) + 4 Co2+(aq) + O2(g) + 24 NH3(aq) → 4 Co(NH3)63+(aq) + 2 H2O(l)

(D) CaCO3(s) → CaO(s) + CO2(g)

(E) 2 H2O2(l) → O2(g) + 2 H2O(l)

The reaction between a Brønsted-Lowry acid and a Brønsted-Lowry base

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 !

catya that's not even a b or c

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.