open system
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open system
so in lecture today dr. lavelle talked about how you can change the energy of a system if you add or subtract substance from the system. how so?
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Re: open system
One method is to say, evaporate water in an open beaker. Basically some of the substance leaves the system.
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Re: open system
Another example is an uncovered pot of hot water. Matter is leaving the system through the steam, and energy as heat is also lost.
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Re: open system
The way I see it is that as noted in the textbook, matter has internal energy (U) which includes the energy of an atom, its electrons, protons, neutrons, and the bonds it forms with other atoms. All of this is energy within the matter, so when it is removed, energy is subtracted
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Re: open system
All matter have their own internal energy, removing a unit of matter from a system means removing part of the internal energy that the system has.
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Re: open system
In all systems, the matter/substance involved in the system contributes to its energy. Because matter can be exchanged with the surroundings of an open system, the addition or removal of substance from the system can change its energy.
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Re: open system
Another way to think of it is to think of a mug of steaming hot chocolate cool down. The hot chocolate/mug lost energy and the surroundings gained energy in form of heat.
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