Many of the stars we see in the night sky are called blue giants. They put out more energy and burn millions of times brighter than the Sun. Why does the Sun appear much larger and brighter from Earth than blue giant stars?

Because it is closer to earth than the other blue giant stars.

Explanation:

The sun is closer to earth than any other big star which means we see it bigger.

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 !

it's c. elements are placed in rows based on how may valencies electrons have.