What is the mass of a 1.00 cubic centimeter piece of iron having a density of 7.90 g/cubic centimeters?

7.90g/cm³ = 7.90g/1cm³ - this density means that 1 cm³ has mass = 7.90 g

Or you can do it another way

1.0 cm³*7.90 g/cm³= 7.90 g

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

they are made of gases.

they have a spherical shape.

they make energy through fusion.