CHM 1032 Lecture Notes - Lecture 15: Boiling Point
Document Summary
The characteristic odor of gasoline is a physical property gasoline does not change its composition when it exhibits its odor. The flammability of gasoline is a chemical property gasoline does change its composition when it burns. The atomic or molecular composition of a substance does not change when the substance displays its physical properties. The boiling point of water a physical property is 100 c. When water boils, it changes from a liquid to a gas, but the gas is still water. Physical change of water from liquid to gas. When water boils, it turns into a gas, but the water molecules are the same in both the liquid water and the gaseous steam. State changes transformations from one state of matter to another, such as from solid to liquid are always physical changes. In a physical change, matter changes its appearance but not its composition. When ice melts, it looks different but its composition is the same.