Final answer:
The statement that potassium forms a sphere when reacting with water is false. Instead, it produces potassium hydroxide and hydrogen gas, though potassium ions in solution can form a 'hydration sphere' with surrounding water molecules.
Step-by-step explanation:
The statement that potassium forms a sphere when reacting with water is false. When potassium reacts with water, it produces potassium hydroxide and hydrogen gas, not a spherical structure. The confusion may arise from discussing hydration spheres, which occur when potassium ions are dissolved in water, such as potassium chloride (KCl) entering an aqueous solution. In these instances, water molecules are attracted to the potassium ions due to ion-dipole interactions, surrounding them and forming a hydration shell, which could be visualized as a sphere at a microscopic level.