Physical Changes Versus Chemical Changes Objective In this lesson, you will Physical and Chemical Properties Substances have properties that help to describe them. Physical Properties The properties of a substance can be measured and observed without altering its structure. Example: you can the boiling point of water by heating it and using a thermometer to measure the temperature at which it begins to boil." In this case, you do alter the water's molecular structure in any way Physical properties of a substance include: conductivity colorfand texture The state of a substance can be described as the n which matter exists. This phase can be either solid, liquid, or _ point is the temperature at which a solid substance changes into its liquid