Chemistry Ppt. 3
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When dealing with phase changes, how many calculations are there?
two: heating and phase changes with no change in temperature
Molar Heat of FUsion
the energy required to melt one mole of a solid
Molar Heat of Vaporization
the energy required to vaporize one mole of liquid
Molar Heat of Sublimation
the energy required to sublime one mole of a solid
the partial pressure of a gas iin equilibrium with liquid at a constant temperature
Only the __ molecules have sufficient __ to escape from the liquid and enter the vapor.
- kinetic energy
The higher the temperature, the __.
larger the number of molecules that have enough energy to escape
- the temperature at which the vapor pressure of hte gaseous molecuels above its liquid reaches atmospheric pressure
- - at this point, the liquid and vapor coexist in equilibrium
normal boiling point
when the atmospheric pressure is exactly one atm
provides a link between vapor pressure, temperature, and molar heat of vaporizaiton
To change a liquid to a gas, what has to occur?
the molecule has to break interactions with molecuels around it
When you incresae the temperature, what happens to the vapor pressure?
increases because more energy is given to liquid molecuels
differnece between evaporation adn boiling
- rate at which its turning into a gas
- evaporation is slower
The relationship between vapor pressure and temperature is __
not linear, but exponential
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