How does the equation for a physical change differ from the equation of a chemical change?

The equation for a physical change typically involves a change in state or appearance of a substance without altering its chemical composition, such as ice melting into water (H₂O(s) → H₂O(l)). In contrast, the equation for a chemical change represents a transformation where reactants are converted into different products, involving the breaking and forming of chemical bonds, like the combustion of propane (C₃H₈ + 5O₂ → 3CO₂ + 4H₂O). Thus, physical changes maintain the same chemical identity, while chemical changes create new substances.