Watch all the terms that apply to each element. Some terms may apply to more than one element. noble gas
alkaline earth
element
inner transition
metal element
main group
element
metalloid
transition metal
element
alkali metal
metal
nonmetal
halogen
a. Phosphorus
b. Fluorine
c. Potassium
d. Iron

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 !

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