Question

when sugar is mixed with water, equilibrium is reached when
multiple choice
molecules of sugar stop moving.
water and sugar molecules are moving at the same speed.
the dissolved sugar molecules are evenly distributed throughout the solution.
there are the same number of water molecules as dissolved sugar molecules.
two tablespoons of coffee are added.

Explanation:

To determine when equilibrium is reached when sugar is mixed with water, we analyze each option:

• "Molecules of sugar stop moving": Molecules are always in motion (due to kinetic energy), so this is incorrect.
• "Water and sugar molecules are moving at the same speed": Equilibrium isn't about equal speeds of different molecules.
• "The dissolved sugar molecules are evenly distributed throughout the solution": In a solution, equilibrium in terms of diffusion (like dissolving sugar) occurs when the solute (sugar) is uniformly distributed, meaning no net movement of sugar molecules (though they still move randomly). This matches the concept of dynamic equilibrium in solutions.
• "There are the same number of water molecules as dissolved sugar molecules": Equilibrium doesn't depend on equal numbers of different molecules.
• "Two tablespoons of coffee are added": Adding coffee is irrelevant to sugar - water equilibrium.

Answer:

C. the dissolved sugar molecules are evenly distributed throughout the solution