Answer:

Physical changes alter a chemical substance's appearance but not its chemical content. Physical changes can be employed to separate mixtures into their constituent compounds, but not to separate compounds into chemical elements or smaller molecules.

Chemical changes occur when a material combines with another to generate a new substance, a process known as chemical synthesis, or when a molecule decomposes into two or more separate chemicals, a process known as chemical decomposition. These processes are known as chemical reactions, and they are generally irreversible unless they are followed by more chemical reactions.

Only physical properties, such as shape and size, are affected by a physical change. Chemical changes the substance's physical and chemical qualities, as well as its makeup