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phase change

Posted: Sun Jan 24, 2016 4:50 pm
by Audrey Kang 2I
Why does solid carbon dioxide go directly into a gas at room temperature? Please explain conceptually and not using phase diagrams.

Re: phase change

Posted: Sun Jan 24, 2016 5:06 pm
by Chem_Mod
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.

Re: phase change

Posted: Sun Jan 24, 2016 8:08 pm
by Lily Wei 1D
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.