The diagram shows changes of state between solid, liquid, and gas. the atoms of a substance gain energy during a change of state. before the change, the atoms are close together and cannot slide past one another. after the change, the substance can fill its container. which arrow represents the change of state described above?

The final state is a gas, because the substance can fill the container.

The molecules in a gas have the highest energy of the three states ant the partilces are far enough away from each other to permit that they move freely and fill the container.

The initial state is solid, becasue the particles cannot slide past one another.

The particles in a solid are tightly packed and can vibrate but not translate,  while in liquid state the particles are close but  can move more more freely and can slide past one another.

So, the change described is from solid to gas. 

Putting salt in vinegar water