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When a chemical system is at dynamic equilibrium, there (are/ are not) visible changes in the system. 

In a saturated solution, the colour intensity is (greater/ the same/ less) over time.

In a saturated solution, the mass of undissolved particles is (the same/ less/ greater) over time. 

When a chemical system is at dynamic equilibrium, the solution must be in a closed system. This means that the volume of water is (changing/ constant), the amount of solute is (constant/changing) , and the temperature is (constant/ changing)