a (ni2+|ni) half cell is paired with a standard hydrogen electrode. if the observed voltage at 25C is +0.429V, what is the Ni2+ concentration?

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.

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air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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c. electrical charges of ionic bonds.