closed vs isolated

[Ekayana Sethi 2K]

Are the pressures and volumes constant in a closed and isolated system?

[Rachel Lu_dis1H]

I don't think they are unless it says otherwise. I do know that if it's a bomb calorimeter volume stays constant

[SitharaMenon2B]

No, specifying the system as closed or isolated doesn't mean that the pressure or volume are constant.

[Justin Folk 3I]

No, closed is just where matter can't escape. isolated is where neither matter nor internal energy can escape

[Michelle Lee 2E]

The text has to say if it is under constant pressure or volume. I don't think assuming is good enough.
I also have a question.
When the text says "ideal", does that mean constant pressure and volume because ideal would be 1 atm and 1M?

[Xin He 2L]

You don't want to assume anything, but if the question says that the reaction happens in a bomb calorimeter, you can assume it's constant volume.

[Sarah 2F]

You can only assume that if the problem says so.

[Alex Nechaev 1I]

Knowing whether a system is closed or isolated only tells you whether it can exchange energy with its surroundings or not. Don't assume that pressures and volumes are constant unless the problem specifically states that they are.

[Annie Lieu-1H]

No, unless the problem specifies. When given just "closed" or "isolated" that deals with energy exchange (or lack thereof).

[804899546]

An example would be the expansion of a balloon. Say the pressure outside the balloon decreased, the volume of the balloon would increase as it expanded. However, it is still a closed system because the balloon never actually lost any matter, it just reacted to outside conditions.

[Justin Folk 3I]

Does heat transfer happen when the balloon loses air?

[Rachel N 1I]

Yes, heat transfer does happens because they system is doing work and losing energy. This energy is replaced by heat flow, q, into the system.