(b) The table below shows the products formed from three experiments using different compounds and the apparatus shown in the figure above.
Compound
State
Product at
cathode
Product at
anode
Molten
Copper
Chlorine
Copper
chloride
Copper
chloride
Potassium
bromide
Aqueous
solution
Copper
Chlorine
Molten
Potassium
Bromine
Use the table above to name the products formed at each electrode if using an
aqueous solution of potassium bromide.
At cathode
At anode

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 !

the atomic mass is the bottom number on the element.

-steel jelly