Describe each of the following as a physical or chemical property: e. Propane gas is compressed to a liquid for placement in a small cylinder.

A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity. Examples include color, boiling point, melting point, and density. In the context of propane gas being compressed, its ability to change from a gas to a liquid under pressure is a physical property, as it does not alter the chemical structure of propane.

A chemical property describes a substance's ability to undergo a specific chemical change or reaction. This includes reactivity with other chemicals, flammability, and acidity. While compressing propane does not change its chemical identity, understanding its chemical properties is essential for recognizing how it behaves in different conditions, such as combustion.

A phase change refers to the transition of a substance from one state of matter to another, such as from gas to liquid or liquid to solid. In the case of propane, when it is compressed, it undergoes a phase change from gas to liquid, which is a physical process. This concept is crucial for understanding how gases can be stored and transported in a more compact form.