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Changes of State
vocab and main ideas -13.4
10
Chemistry
11th Grade
04/15/2009

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Term
sublimation
Definition
the process in which a solid changes to a gas or vapor without passing through the liquid state
Term
phase diagram
Definition
a graph showing the conditions at which a substance exists as a solid, liquid, or vapor
Term
triple point
Definition
the point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another
Term
why does sublimation occur?
Definition
because solids have a vapor pressure
Term
some uses of sublimation...
Definition
to seperate mixtures/ to purify compounds
Term
when does sublimation occur
Definition
when the vapor pressure exceeds the atmospheric pressure at room temperature
Term
what does a line seperating two phases on a phase diagram mean?
Definition
tells the temperature and pressures where the substance is at equilibrium (of two phases)
Term
what is the y-axis on a phase diagram?
Definition
pressure
Term
what is the x-axis on a phase diagram?
Definition
temperature
Term
what is a phase diagram used for?
Definition
estimating boiling/ melting/ freezing points
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