Liquid gold is poured into molds and cools to become solid bars. The gold is .
Liquid nitrogen becomes a gas when it is poured out of its container. The nitrogen is
.
Solid iron is heated to high temperatures so that it becomes a liquid. The iron is
.
Water vapor in the air becomes tiny liquid droplets that form fog. The water is
.
In a very cold cryogenic freezer, solid oxygen forms on the walls from the oxygen gas in the air. The oxygen is
.
In the high desert, snow changes to water vapor without becoming liquid water. The snow is
.

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

hi,

the capital city of australia is canberra.

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 !