Difference between Pressure and compression/expansion?

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Diwana Lucero 3K
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Difference between Pressure and compression/expansion?

Postby Diwana Lucero 3K » Sun Nov 13, 2016 11:00 am

Can someone explain if there's a difference between pressure and compression/expansion? One of the questions in the workbook quiz asked if expansion occurs, what will happen to the partial pressure of the product and I wasn't sure how to approach the problem.

Julianne_Zingmond_1E
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Re: Difference between Pressure and compression/expansion?

Postby Julianne_Zingmond_1E » Sun Nov 13, 2016 12:26 pm

Theoretically, if the gas has room to expand, the pressure would decrease. If the volume decreases and the gas is compressed, the pressure would increase. This is all based off of the ideal gas equation of PV=nRT, where P and V are inversely related.

edward_qiao_3I
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Re: Difference between Pressure and compression/expansion?

Postby edward_qiao_3I » Mon Nov 14, 2016 3:11 pm

Compression/expansion is just a description of change in volume, which in turn has an impact on pressure given by P=nRT/V, where pressure and volume have an inverse relationship. Most of these problems also hold temperature constant, so you can just use P=n/V

Jata_Kavya_3A
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Re: Difference between Pressure and compression/expansion?

Postby Jata_Kavya_3A » Thu Nov 17, 2016 9:46 pm

How does expansion/compression affect which way the equilibrium shifts? like what is the relationship

Justin_Yi_1J
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Re: Difference between Pressure and compression/expansion?

Postby Justin_Yi_1J » Thu Nov 17, 2016 9:57 pm

When expansion or compression occurs, the system will try to minimize the change. If it is compressed, the pressure increases. To counteract this, the system shifts to the side with less moles of gas in order to minimize the change in pressure. Vice-versa for expansion.

JELCI_BARRAZA_1C
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Re: Difference between Pressure and compression/expansion?

Postby JELCI_BARRAZA_1C » Thu Nov 17, 2016 10:10 pm

which way does a reaction shift if expansion occurs?


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