Water Is Made Of Two Hydrogen Atoms And One Oxygen Atom Bonded Together. Julia Is Describing How Water Undergoes A Physical Change When It Boils. She Says That The Particles Shift To Be Farther Apart And That The Oxygen And Hydrogen Separate. She Also Says That The Total Mass Of The Steam Is The Same As The Initial Water, And That Heat Energy Was Required To Cause The Change. She Finishes Her Description By Saying That The Steam Can Be Turned Back Into Water If It Is Cooled. Which Is The Mistake In Her Description?. Julia is describing how water undergoes a physical change when it boils. In reality, the oxygen and hydrogen atoms in a water molecule do not.

Julia is describing how water undergoes a physical change when it boils. Julia is describing how water undergoes a physical change when it boils. Water is made up of two hydrogen atoms covalently bonded to an oxygen atom (molecular formula = h 2 o) while this covalent bonding involves the sharing of electrons, they are not.