When sulfuric acid is mixed with water, a chemical reaction takes place. The acid dissociates into hydrogen ions (H+) and sulfate ions (SO42-), while the water molecules dissociate into hydrogen ions and hydroxide ions (OH-). The hydrogen ions from the acid then react with the hydroxide ions from the water to form water molecules. This reaction produces heat and releases energy, which is a chemical change.
The resulting solution contains hydronium ions (H3O+) and sulfate ions, and it exhibits different properties compared to the original sulfuric acid and water.
