If a piece of copper metal is placed in calcium chloride solution. What will you observe? Give reason for your answer. 

Explanation:

Reduction potential of Copper metal is .34 V and reduction potential of Calcium is - 2.87 V . So copper will not be able to reduce Calcium chloride to calcium . Hence no reaction will take place when a piece of copper metal is placed in calcium chloride solution .

Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.