How many moles of iron are needed to produce 12.3 grams of iron(II) sulfide(Fes)? 8Fe + S8 —> 8FeS

The arrangement of particles is most ordered in a sample of

If a particle has z = 25 and 23 electrons, what is its charge?

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground, its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy