Final answer:
An open system allows for both heat and matter to transfer between the system and its surroundings, exemplified by a pot of boiling water.
Step-by-step explanation:
In chemistry, there are different types of systems that describe energy and matter interactions with their surroundings. For an open system, the statement that is true is that heat and matter can both transfer between the system and the surroundings. A common example of an open system is a pot of boiling water on a stove, where energy in the form of heat is applied to the water and matter in the form of water vapor is released into the air.