phase change

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Audrey Kang 2I
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Joined: Fri Sep 25, 2015 3:00 am

phase change

Postby Audrey Kang 2I » Sun Jan 24, 2016 4:50 pm

Why does solid carbon dioxide go directly into a gas at room temperature? Please explain conceptually and not using phase diagrams.

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Re: phase change

Postby Chem_Mod » Sun Jan 24, 2016 5:06 pm

You can supply heat enough to break the inter-molecular bonds. C atoms are at gas phase. Remember that temperature is not everything, you can still keep temperature unchanged while let the reaction happens by playing with pressure.

Lily Wei 1D
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Joined: Fri Sep 25, 2015 3:00 am

Re: phase change

Postby Lily Wei 1D » Sun Jan 24, 2016 8:08 pm

Pressure and temp both play a role on how a substance would behave. CO2 can go through sublimation because it was given the conditions, like 1 atm and room temp. I think it would go through the "normal" solid, liquid, gas phase changes if the pressure were higher. It's like how water could also boil (liquid to gas) if the pressure is lowered.

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