When both forward and reverse changes are physical changes, the resulting equ a a. physical equilibrium b. chemical equilibrium c. reversible reaction d. none of the above

When both forward and reverse changes are physical changes,the resulting equ a Physical equilibrium.  

So your answer is A. Physical Equilibrium

this could be newton#'s law of cooling. the cooling curve is exponential

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.