CFE Physical Science Honors Practice Test 2025 – Your All-in-One Resource to Achieve Exam Excellence!

Question: 1 / 400

What does an open system allow for?

A system that cannot exchange energy

A system in which matter cannot enter

A system that allows matter to enter from or escape to the surroundings

An open system is defined by its ability to exchange both matter and energy with its surroundings. This characteristic allows for interactions with the environment, meaning that substances can flow into the system or out of it. For instance, consider a cup of hot coffee left on a table: it can lose heat to the surrounding air and also allows for vapors (water molecules) to escape into the atmosphere. This flexibility distinguishes open systems from closed or isolated systems, which do not permit such exchanges. The key aspect of an open system is its dynamic nature, where various processes like chemical reactions, mass transfer, and energy flow can occur, significantly influencing the system's overall behavior and properties.

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A system that is completely isolated

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