## Difference between Pressure and compression/expansion?

Diwana Lucero 3K
Posts: 26
Joined: Fri Jul 15, 2016 2:00 am

### Difference between Pressure and compression/expansion?

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
Posts: 22
Joined: Wed Sep 21, 2016 1:59 pm
Been upvoted: 1 time

### Re: Difference between Pressure and compression/expansion?

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
Posts: 27
Joined: Tue Oct 04, 2016 2:02 am
Been upvoted: 1 time

### Re: Difference between Pressure and compression/expansion?

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
Posts: 22
Joined: Wed Sep 21, 2016 1:57 pm

### Re: Difference between Pressure and compression/expansion?

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

Justin_Yi_1J
Posts: 27
Joined: Fri Jul 22, 2016 2:00 am
Been upvoted: 1 time

### Re: Difference between Pressure and compression/expansion?

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
Posts: 17
Joined: Wed Sep 21, 2016 2:00 pm

### Re: Difference between Pressure and compression/expansion?

which way does a reaction shift if expansion occurs?

Return to “Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions”

### Who is online

Users browsing this forum: No registered users and 1 guest