Pressure vs. Volume

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Jose Robles 1D
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Joined: Fri Aug 02, 2019 12:15 am

Pressure vs. Volume

Postby Jose Robles 1D » Sun Jan 26, 2020 7:21 pm

In terms of direction, how does each factor effect the reaction's direction? I'm curious because they seem quite similar but I have trouble differentiating the two in term of change.

J Medina 2I
Posts: 102
Joined: Wed Sep 25, 2019 12:17 am

Re: Pressure vs. Volume

Postby J Medina 2I » Sun Jan 26, 2020 7:26 pm

A change in volume will also directly affect the pressure of a system. A decrease in volume will lead to a higher pressure and an increase in volume will lead to lower pressure. Thinking of the equation PV=nRT is helpful since it shows how pressure and volume are inversely proportional.

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Re: Pressure vs. Volume

Postby KarineKim2L » Sun Jan 26, 2020 7:46 pm

If you decrease the volume, pressure will increase. You can think of this logically; if you have a certain amount of material that takes up a certain amount of space, and you try to squish it into a smaller space, the pressure will increase.

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Re: Pressure vs. Volume

Postby JohnWalkiewicz2J » Sun Jan 26, 2020 8:04 pm

Assuming that moles (n) is constant, if you increase the pressure, volume will decrease, and whatever side has more moles of reactants/products, the reaction will shift to the opposite.

Anish Natarajan 4G
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Joined: Thu Jul 25, 2019 12:16 am

Re: Pressure vs. Volume

Postby Anish Natarajan 4G » Sun Jan 26, 2020 8:17 pm

More V/Less P=shift to side with more mols and vice versa

kendal mccarthy
Posts: 109
Joined: Wed Nov 14, 2018 12:22 am

Re: Pressure vs. Volume

Postby kendal mccarthy » Sun Jan 26, 2020 11:25 pm

One trick I like to use is to look at the relationship between the variables of the PV=nRT equation. because P and V are on the same side of the equation that means they have an inverse relationship. This means an increase in one leads to a decrease in the other and vice versa.

Gabriel Ordonez 2K
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Joined: Sat Jul 20, 2019 12:15 am

Re: Pressure vs. Volume

Postby Gabriel Ordonez 2K » Sun Jan 26, 2020 11:28 pm

Pressure and volume are inversely related. An increase in volume decreases pressure and decrease in volume increases pressure, so think of them this way when approaching equilibrium shifts. The side with more moles of gas will shift to the other reactionary side with an increase in pressure or decrease in volume. The opposite happens with the opposite conditions.

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