What is the difference between a physical change and a chemical change? a physical change is only a phase change but a chemical change can be any type of change. a physical change does not change the identity of the substance but the chemical change does. a physical change breaks and forms bonds but a chemical change does not change the bonds. a physical change only changes the color but a chemical change never changes the color.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.