Final answer:
The correct answer is closed system because it can exchange energy but not matter with its surroundings.
Step-by-step explanation:
When identifying the system for a sealed tank, it is essential to understand the types of systems in chemistry to provide the correct answer. A sealed tank is considered a closed system.
Unlike an open system, which can exchange both energy and matter with its environment, a closed system can transfer energy but not matter. A sealed tank does not allow matter to enter or leave, although it can still transfer energy, such as heat, with its surroundings. This contrasts with an isolated system, which does not exchange either energy or matter.
An example of an isolated system approximation would be an insulated thermos, which transfers energy very slowly. However, in typical real-world situations, truly isolated systems do not exist as there is always some transfer of energy, adhering to the conservation of energy principle.