What would be a good model of equilibrium? (You don't have to involve chemical equilibrium.)

Try using a solid and another type of phase like water and have it at different temperatures. Once you have done that, let them sit in your location that you have them. Make sure to have their starting temperatures and their ending temperatures which should be equilibrium because of the room temperature.

Explanation:

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When a melted popsicle is put into a freezer and later the melted popsicle becomes frozen after a length of time.

Explanation: This is an example of thermal equilibrium because the substance has reached the same temperature as it's sourroundings.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)