Pure Substances

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Pure Substances

Postby 305174946 » Fri Jan 11, 2019 10:48 am

In lecture we discussed how liquids and solids were not included in the chemical equilibrium equation because they were pure substances. Can someone please explain why gases are not pure substances.

Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Pure Substances

Postby 505095972 » Fri Jan 11, 2019 11:49 am

I think it is more significant that gases effect activity (which is a concept that is a little more complicated so Dr. Lavelle said we don’t need to really focus on it) and activity is how equilibrium constants are found so therefore gases explain equilibrium constants.

Michael Novelo 4G
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Re: Pure Substances

Postby Michael Novelo 4G » Fri Jan 11, 2019 11:58 am

Pure substances can't be separated into other substances. Air for example is a mixture of different gases so it is not 'pure'. Pure substances are also made of the same material throughout so a solid and liquid are physically the same throughout I believe.

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