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Chemistry Unit 5

Vocabulary Words

TermDefinition
sublimation an endothermic phase transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase
kinetic molecular theory several rules that describe the behavior of gases/ The nature of gas molecules was examined by scientists, such as Robert Boyle and Jacques Charles, who outlined their observations in several laws that eventually became the Kinetic Molecular Theory.
phase diagram a diagram composed of equilibrium curves between different phases of the same substance
molar enthalpy of fusion the amount of energy needed to change one mole of a substance from the solid phase to the liquid phase at constant temperature and pressure
STP the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atm pressure
critical point a point on a phase diagram at which both the liquid and gas phases of a substance have the same density, and are therefore indistinguishable
deposition a process where a gas changes phase and turns directly in solid without passing through the liquid phase. It's also the opposite of sublimation
triple point the temperature and pressure at which the solid, liquid, and vapor phases of a pure substance can coexist in equilibrium
molar enthalpy of vaporization the amount of energy needed to change one mole of a substance from the liquid phase to the gas phase at constant temperature and pressure
nonvolatile the tendency of a substance to vaporize. Volatility is directly related to a substance's vapor pressure
Created by: khyia.gibbs
 

 



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