Why is putting food coloring in icing a chemical change?

Putting food coloring in icing is not a chemical change. It is a physical change because the icing does not change its chemical composition when the food coloring is added. The food coloring simply disperses throughout the icing, resulting in a different color.

A chemical change, on the other hand, occurs when the chemical composition of a substance changes. This can happen when two or more substances react with each other to form a new substance, or when a substance breaks down into simpler substances. Chemical changes are often accompanied by changes in color, temperature, or the formation of gas.