7. Why does the Sun appear to rise in the east and set in the west? A. The Sun revolves around Earth causing it to rise in the east and set in
the west.
B. Earth rotates toward the west causing the Sun to appear to rise in the east
and set in the west.
C. Light reflected from the Moon causes the Sun to appear to rise in the east
and set in the west.
D. Earth rotates toward the east causing the Sun to appear to rise in the
east and set in the west.

I'm sure the answer is B.

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 !

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).