Final answer:
A sealed jar is a real-world example of a closed system since it allows energy but not matter transfer, while a running faucet is an example of an open system where both energy and matter are exchanged.
Step-by-step explanation:
When considering real-world examples of closed systems and open systems, it's essential to understand the criteria for each. In a closed system, energy can be exchanged with the surroundings, but matter cannot. In contrast, an open system can exchange both energy and matter with its surroundings. Therefore, a good example of a closed system is a sealed jar, as it allows the transfer of energy (in the form of heat, for example) but not matter. On the other hand, a running faucet is an excellent example of an open system because it allows both water (matter) and energy to be transferred to its surroundings.