PLEASE ANSWE

Darwin is given an iron nail, a wooden pencil, a glass rod, a piece of copper wire, a 1.5-volt battery, and a 5-volt battery in order to make an electromagnet. Which combination of materials would allow Darwin to make the strongest electromagnet?

A. iron nail, copper wire, 1.5-volt battery
B. iron nail, copper wire, 5-volt battery
C. wooden pencil, copper wire, 5-volt battery
D. wooden pencil, copper wire, 1.5-volt battery

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 !

idk what is it? is this a question that you know the answer or u dont