Apart of the periodic table is shown. a portion of the first two columns of the periodic table is shown. column one from top to bottom reads 11 sodium, 19 potassium, and 37 rubidium. column two reads 12 magnesium, 20 calcium, and 38 strontium. which of the following elements is more reactive than the others?

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

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b