Calcium chloride in water: a chemical change

The process you described, where solid calcium chloride (CaCl₂) dissolves in water and the temperature increases, is an example of a **chemical change**. Here's why: 1. **Heat Generation:** The increase in temperature indicates that heat is being released, which often suggests a chemical reaction is taking place. This exothermic process is characteristic of chemical changes where bonds are breaking and forming, releasing energy. 2. **Dissociation:** When calcium chloride dissolves in water, it dissociates into calcium ions (Ca²⁺) and chloride ions (Cl⁻). The process of these ions separating and interacting with the water molecules involves breaking ionic bonds in the solid and forming new interactions with water, which are chemical processes. Therefore, due to the nature of the interactions at the molecular level and the heat released, dissolving calcium chloride in water where the temperature increases is a chemical change.