Question

Sugar cubes are placed in water. how will the mixture be affected by stirring the water, by breaking apart the sugar cubes, or by raising the temperature?

Answer 1

When the sugar cubes are placed in water, then, the mixture will be affected by stirring the water. 
By stirring the water, the sugar cubes dissolve in water. The molecules of sugar cubes interact with water molecules in the jar. But when more sugar is added to the water, there comes a saturation point when no more sugar will be dissolved and it will settle down. Then, by raising the temperature the settled sugar will be dissolved too.

Answer 2

each action will increase the speed that the sugar dissolves in the water