Verify Thermochemistry answer (no calculations)

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Discussion Overview

The discussion revolves around identifying the type of thermodynamic system represented by hot coffee in a vacuum flask (thermos). Participants explore the classifications of closed, open, and isolated systems, focusing on interactions with the surroundings and heat transfer.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant initially proposes that the thermos is a closed system because the coffee does not interact with the surroundings.
  • Another participant suggests that the classification depends on whether the lid of the flask is on, indicating it could be open if the lid is off, or closed and isolated if the lid is on tightly.
  • A later reply supports the idea that the system is isolated due to the lack of heat transfer, although this is based on limited information.
  • Another participant asserts that the system is definitely isolated, citing no mass or energy transfer.

Areas of Agreement / Disagreement

Participants express differing views on the classification of the system, with some arguing for isolated status while others consider the conditions under which it could be classified as closed or open. No consensus is reached.

Contextual Notes

Participants acknowledge a lack of information and the dependence on the condition of the flask's lid, which affects the classification of the system.

ace123
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I just want to make sure my logic is correct.

Hot coffee in a vacuum flask (thermos) is an example of what type of sytem?

Choices:

Closed
Open
Isolated


I thought it was closed system because the coffee is not interacting with the surroundings. But one of my classmates said he thought it was open because it's interacting with the flask. So which one of is correct?

Edit: I know believe it's isolated because heat is not exchanged. at least I don't think it is
 
Last edited:
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heres my .02 (too much fun to stay away :) )

open or closed? depends on if the lid is on and tightened on the flask

the system is the coffee, the flask (and its vacuum ) is the boundary, the surroundings is the rest of the universe outside of the flask.

open if the lid is not on
closed and isolated if it is on and closed tight
 
Yea we don't have that much information. But apparently it was isolated because heat it not transfered. So thank you for your .02 :smile:
 
Definitely isolated - no mass transfer and no energy transfer.
 

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